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Those Republicans of the Twelfth Congress who supported going to war with Great Britain in the War Of 1812 were called " War Hawk s." The Twelfth Congress was thus sometimes known as the " War Congress ."
- Willis Alston (''Representative''), Republican , NC
- Joseph Anderson (''Senator''), Republican , TN
- William Anderson (''Representative''), Republican , PA
- Stevenson Archer (''Representative''), Republican , MD
- Daniel Avery (''Representative''), Republican , NY
- Ezekiel Bacon (''Representative''), Republican , MA
- John Baker (''Representative''), Federalist , VA
- David Bard (''Representative''), Republican , PA
- William Barnett (''Representative''), Republican , GA
- Josiah Bartlett, Jr. (''Representative''), Republican , NH
- Burwell Bassett (''Representative''), Republican , VA
- James A. Bayard, Sr. (''Senator''), Federalist , DE
- George Mortimer Bibb (''Senator''), Republican , KY
- William Wyatt Bibb (''Representative''), Republican , GA
- Abijah Bigelow (''Representative''), Federalist , MA
- William Blackledge (''Representative''), Republican , NC
- Harmanus Bleecker (''Representative''), Federalist , NY
- Thomas Blount (''Representative''), Republican , NC
- Shadrack Bond (''Delegate''), -, Illinois Territory
- Adam Boyd (''Representative''), Republican , NJ
- Stephen Row Bradley (''Senator''), Republican , VT
- James Breckinridge (''Representative''), Federalist , VA
- Richard Brent (''Senator''), Republican , VA
- Elijah Brigham (''Representative''), Federalist , MA
- James Brown (''Senator''), Republican , LA
- Robert Brown (''Representative''), Republican , PA
- William Armisted Burwell (''Representative''), Republican , VA
- William Butler (''Representative''), Republican , SC
- John Caldwell Calhoun (''Representative''), Republican , SC
- Alexander Campbell (''Senator''), Republican , OH
- George Washington Campbell (''Senator''), Republican , TN
- Francis Carr (''Representative''), Republican , MA
- Epaphroditus Champion (''Representative''), Federalist , CT
- Christopher Grant Champlin (''Senator''), Federalist , RI
- Langdon Cheves (''Representative''), Republican , SC
- Martin Chittenden (''Representative''), Federalist , VT
- Henry Clay (''Representative''), Republican , KY
- Matthew Clay (''Representative''), Republican , VA
- John Clopton (''Representative''), Republican , VA
- Howell Cobb (''Representative''), Republican , GA
- James Cochran (''Representative''), Republican , NC
- Lewis Condict (''Representative''), Republican , NJ
- John Condit (''Senator''), Republican , NJ
- Thomas Burrage Cooke (''Representative''), Republican , NY
- William Crawford (''Representative''), Republican , PA
- William Harris Crawford (''Senator''), Republican , GA
- Charles Cutts (''Senator''), Republican , NH
- Richard Cutts (''Representative''), Republican , MA
- Samuel Whittlesey Dana (''Senator''), Federalist , CT
- John Davenport (''Representative''), Federalist , CT
- Roger Davis (''Representative''), Republican , PA
- John Dawson (''Representative''), Republican , VA
- Joseph Desha (''Representative''), Republican , KY
- DESTRÉHAN, Jean Noel (''Senator''), Unknown , LA
- Samuel Dinsmoor (''Representative''), Republican , NH
- Elias Earle (''Representative''), Republican , SC
- William Ely (''Representative''), Federalist , MA
- James Emott (''Representative''), Federalist , NY
- William Findley (''Representative''), Republican , PA
- James Fisk (''Representative''), Republican , VT
- Asa Fitch (Representative) , Federalist , NY
- Jesse Franklin (''Senator''), Republican , NC
- Meshack Franklin (''Representative''), Republican , NC
- John Gaillard (''Senator''), Republican , SC
- Barzillai Gannett (''Representative''), Republican , MA
- Obadiah German (''Senator''), Republican , NY
- Thomas Gholson, Jr. (''Representative''), Republican , VA
- William Branch Giles (''Senator''), Republican , VA
- Nicholas Gilman (''Senator''), Republican , NH
- Thomas Ruggles Gold (''Representative''), Federalist , NY
- Charles Goldsborough (''Representative''), Federalist , MD
- Chauncey Goodrich (''Senator''), Federalist , CT
- Peterson Goodwyn (''Representative''), Republican , VA
- Edwin Gray (''Representative''), Federalist , VA
- Isaiah Lewis Green (''Representative''), Republican , MA
- Andrew Gregg (''Senator''), Republican , PA
- Thomas Peabody Grosvenor (''Representative''), Federalist , NY
- Felix Grundy (''Representative''), Republican , TN
- Bolling Hall (''Representative''), Republican , GA
- Obed Hall (''Representative''), Republican , NH
- John Adams Harper (''Representative''), Republican , NH
- Aylett Hawes (''Representative''), Republican , VA
- Edward Hempstead (''Delegate''), -, Missouri Territory
- Outerbridge Horsey (''Senator''), Federalist , DE
- Jeremiah Brown Howell (''Senator''), Republican , RI
- Jacob Hufty (''Representative''), Federalist , NJ
- John Pratt Hungerford (''Representative''), Republican , VA
- William Hunter (''Senator''), Federalist , RI
- John M. Hyneman (''Representative''), Republican , PA
- Richard Jackson, Jr. (''Representative''), Federalist , RI
- Jonathan Jennings (''Delegate''), -, Indiana Territory
- Richard Mentor Johnson (''Representative''), Republican , KY
- Joseph Kent (''Representative''), Republican , MD
- Philip Barton Key (''Representative''), Federalist , MD
- William Rufus De Vane King (''Representative''), Republican , NC
- Abner Lacock (''Representative''), Republican , PA
- John Lambert (''Senator''), Republican , NJ
- Lyman Law (''Representative''), Federalist , CT
- Joseph Lefever (''Representative''), Republican , PA
- Michael Leib (''Senator''), Republican , PA
- Joseph Lewis, Jr. (''Representative''), Federalist , VA
- Peter Little (''Representative''), Republican , MD
- Robert Le Roy Livingston (''Representative''), Federalist , NY
- James Lloyd (''Senator''), Federalist , MA
- William Lowndes (''Representative''), Republican , SC
- Aaron Lyle (''Representative''), Republican , PA
- Nathaniel Macon (''Representative''), Republican , NC
- Allan Bowie Magruder (''Senator''), Republican , LA
- George Clifford Maxwell (''Representative''), Republican , NJ
- Archibald McBryde (''Representative''), Federalist , NC
- William McCoy (''Representative''), Jacksonian , VA
- Samuel McKee (''Representative''), Republican , KY
- Alexander McKim (''Representative''), Republican , MD
- Arunah Metcalf (''Representative''), Republican , NY
- James Milnor (''Representative''), Federalist , PA
- Samuel Latham Mitchill (''Representative''), Republican , NY
- John Montgomery (''Representative''), Republican , MD
- Thomas Moore (''Representative''), Republican , SC
- James Morgan (''Representative''), Republican , NJ
- Jeremiah Morrow (''Representative''), Republican , OH
- Jonathan Ogden Moseley (''Representative''), Federalist , CT
- Hugh Nelson (''Representative''), Republican , VA
- Anthony New (''Representative''), Republican , KY
- Thomas Newbold (''Representative''), Republican , NJ
- Thomas Newton, Jr. (''Representative''), Republican , VA
- Stephen Ormsby (''Representative''), Republican , KY
- William Paulding, Jr. (''Representative''), Republican , NY
- Joseph Pearson (''Representative''), Federalist , NC
- Israel Pickens (''Representative''), Republican , NC
- William Piper (''Representative''), Republican , PA
- Timothy Pitkin (''Representative''), Federalist , CT
- James Pleasants (''Representative''), Republican , VA
- George Poindexter (''Delegate''), -, Mississippi Territory
- Benjamin Pond (''Representative''), Republican , NY
- John Pope (''Senator''), Republican , KY
- Peter Buell Porter (''Representative''), Republican , NY
- Thomas Posey (''Senator''), Republican , LA
- Elisha Reynolds Potter (''Representative''), Federalist , RI
- Josiah Quincy III (''Representative''), Federalist , MA
- John Randolph (''Representative''), -, VA
- Philip Reed (''Senator''), Republican , MD
- William Reed (''Representative''), Federalist , MA
- John Rhea (''Representative''), Republican , TN
- William Merchant Richardson (''Representative''), Republican , MA
- Henry Moore Ridgely (''Representative''), Federalist , DE
- Samuel Ringgold (''Representative''), Republican , MD
- John Roane (''Representative''), Republican , VA
- Jonathan Roberts (''Representative''), Republican , PA
- Thomas Bolling Robertson (''Representative''), Republican , LA
- Jonathan Robinson (''Senator''), Republican , VT
- William Rodman (''Representative''), Republican , PA
- Ebenezer Sage (''Representative''), Republican , NY
- Thomas Sammons (''Representative''), Republican , NY
- Lemuel Sawyer (''Representative''), Republican , NC
- Ebenezer Seaver (''Representative''), Republican , MA
- John Sevier (''Representative''), Republican , TN
- Adam Seybert (''Representative''), Republican , PA
- Samuel Shaw (''Representative''), Republican , VT
- Daniel Sheffey (''Representative''), Federalist , VA
- John Smilie (''Representative''), Republican , PA
- George Smith (''Representative''), Republican , PA
- John Smith (''Representative''), Republican , VA
- John Smith (''Senator''), Republican , NY
- Samuel Smith (''Senator''), Republican , MD
- Richard Stanford (''Representative''), Republican , NC
- Silas Stow (''Representative''), Republican , NY
- William Strong (''Representative''), Republican , VT
- Philip Stuart (''Representative''), Federalist , MD
- Lewis Burr Sturges (''Representative''), Federalist , CT
- George Sullivan (''Representative''), Federalist , NH
- Samuel Taggart (''Representative''), Federalist , MA
- Charles Tait (''Senator''), Republican , GA
- John Taliaferro (''Representative''), Republican , VA
- Benjamin Tallmadge (''Representative''), Federalist , CT
- Peleg Tallman (''Representative''), Republican , MA
- John Taylor (''Senator''), Republican , SC
- Uri Tracy (''Representative''), Republican , NY
- George Michael Troup (''Representative''), Republican , GA
- Charles Turner, Jr. (''Representative''), Republican , MA
- James Turner (''Senator''), Republican , NC
- Pierre Van Cortlandt, Jr. (''Representative''), Republican , NY
- Joseph Bradley Varnum (''Representative''), Republican , MA
- Laban Wheaton (''Representative''), Federalist , MA
- Leonard White (''Representative''), Federalist , MA
- Robert Whitehill (''Representative''), Republican , PA
- Jenkin Whiteside (''Senator''), Republican , TN
- William Widgery (''Representative''), Republican , MA
- David Rogerson Williams (''Representative''), Republican , SC
- Thomas Wilson (''Representative''), Federalist , VA
- Richard Winn (''Representative''), Republican , SC
- Thomas Worthington (''Senator''), Republican , OH
- Robert Wright (''Representative''), Republican , MD
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