Most Liberal House Members -- PICTURES

Key Liberal Stand: Rep. Michael Capuano, D-Mass., is a staunch supporter of the labor movement; in reference to the Wisconsin budget protests, he said that it's sometimes necessary "to get out on the streets and get a little bloody when necessary." (Courtesy of Michael Capuano)

Key Liberal Stand: Rep. Judy Chu, D-Calif., voted against the Budget Control Act of 2011 in part because it didn't close corporate tax loopholes and because it allowed unemployment benefits to expire. (Damian Dovarganes/AP)

Key Liberal Stand: Rep. Hansen Clarke, D-Mich., said last year that troops should start coming home from Afghanistan. (Carlos Osorio/AP)

Key Liberal Stand: Rep. William Lacy Clay, D-Mo., is a vice chairman of the Congressional Progressive Caucus, a caucus that his father helped found. (Jeff Roberson/AP)

Key Liberal Stand: Rep. Donna Edwards, D-Md., introduced a constitutional amendment that encourages Congress and the states to pass laws restricting corporate spending in elections. (Chet Susslin)

Key Liberal Stand: Rep. Keith Ellison, D-Minn., a Muslim, broke down in tears at a House Homeland Security Committee hearing on Muslim radicalization. He accused Chairman Peter King, R-N.Y., of "ascribing the evil acts of a few individuals to an entire community." (Chet Susslin)

Key Liberal Stand: Rep. Bob Filner, D-Calif., represents a border district and is the sponsor of the Visitors Interested in Strengthening America Act, which would ease entry requirements for Mexican children wanting to visit the U.S. (Evan Vucci/AP)

Key Liberal Stand: Rep. Raul Grijalva, D-Ariz., is the cochair of the Congressional Progressive Caucus. (Chet Susslin)

Key Liberal Stand: Rep. Mike Honda, D-Calif., has cosponsored bills such as the End Big Oil Tax Subsidies Act of 2011 and the Responsible End to the War in Afghanistan Act. (Lawrence Jackson/AP)

Key Liberal Stand: Rep. Jesse Jackson Jr., D-Ill., introduced a constitutional amendment that would guarantee high-quality health care to all Americans. (Chet Susslin)

Key Liberal Stand: Rep. Barbara Lee, D-Calif., sponsored a repeal of the 2001 authorization for use of military force that enables the president to use the military in the war on terrorism. (Alex Brandon/AP)

Key Liberal Stand: Rep. Grace Napolitano, D-Calif., has made water quality a pet issue, and she fought hard against a GOP-sponsored bill, the San Joaquin Valley Water Reliability Act, that she says would weaken water-quality standards in California. (Ron Edmonds/AP)

Key Liberal Stand: Rep. John Olver, D-Mass., has cosponsored a number of bills popular with Democrats, including the Respect for Marriage Act, the Responsible End to the War in Afghanistan Act, and the Employment Nondiscrimination Act. (Lawrence Jackson/AP)

Key Liberal Stand: Rep. Frank Pallone, D-N.J., is the sponsor of the No New Drilling Act of 2011, which would prohibit any new drilling leases in the Outer Continental Shelf. (Bill Kostroun/AP Images for HISTORY® and Houghton Mifflin Harcourt)

Key Liberal Stand: Rep. Donald Payne, D-N.J., sponsored a resolution "recognizing the importance labor unions play in ensuring a strong middle class by advocating for more-equitable wages, humane work conditions, improved benefits, and increased civic engagement by everyday workers." (Susan Walsh/AP)

Key Liberal Stand: Rep. Jose Serrano, D-N.Y., who represents a district that is 66.5 percent Hispanic, is the sponsor of legislation that would repeal the trade embargo against Cuba. (Harry Hamburg/AP)

Key Liberal Stand: Rep. Pete Stark, D-Calif., is the sponsor of the Defense and Deficit Reduction Act, which places a cap on defense spending. (Terry Ashe/AP)

Key Liberal Stand: Rep. Paul Tonko, D-N.Y., is the sponsor of the Keeping Social Security Solvent Act, which would apply the Social Security tax to all incomes, not just the first $110,100 earned. (Mike Groll/AP)

Key Liberal Stand: Rep. Lynn Woolsey, D-Calif., is the sponsor of the Public Option Deficit Reduction Act, which would implement the so-called public option—fiercely unpopular with conservatives—that was stripped out of the 2010 health care law. (Manuel Balce Ceneta/AP)