Bernie Sanders weighs a bid for president
Sen. Bernie Sanders (I-Vt.), right, talks with local residents after a town hall meeting in Ames, Iowa, on Dec. 16, 2014. The self-styled socialist would probably run in the Democratic caucuses as a liberal voice in a field that could include Hillary Rodham Clinton. (Charlie Neibergall / Associated Press)
Sanders in Ames. Many Democrats hoped Democratic Sen. Elizabeth Warren of Massachusetts would challenge Clinton. But since she hasn’t, some on the left have turned to Sanders, 73. (Charlie Neibergall / Associated Press)
Sanders at a news conference on Capitol Hill. He insists that he won’t seek to undermine Clinton or split Democrats. “I will not play the role of spoiler,” he says. (J. Scott Applewhite / Associated Press)
Sanders, right, and Rep. Jeff Miller (R-Fla.) at the U.S. Capitol on July 28, 2014. Sanders has worked with Republicans on legislation targeting “corporate welfare” and caring for the nation’s veterans. (Chip Somodevilla / Getty Images)
Sanders speaks to low-wage federal contract workers on Dec. 4, 2014, during a protest where the workers demanded presidential action to win an increase to $15-an-hour wage. (Win McNamee / Getty Images)