Former Maryland Governor Martin O'Malley as he announces his intention to seek the Democratic presidential nomination during a speech in Federal Hill Park in Baltimore, Maryland.
Democratic presidential hopeful Hillary Clinton speaks with Frederic Hunt, a minister at First Calvary Baptist Church, during a campaign stop Wednesday at The Main Street Bakery in Columbia, S.C.
The State Department is releasing 296 emails from Hillary Clinton's email account during her tenure as secretary of state. The correspondence relates to the attack on the U.S. consulate in Benghazi, Libya.
M. Spencer Green/AP
Former Florida Gov. Jeb Bush had a tough week with his changing positions on the Iraq War and trying to explain whether he would have authorized it, knowing what we know now.
Ross D. Franklin/AP
Former President Bill Clinton campaigns before the 2014 elections for former Sen. Mark Pryor, center, and Mike Ross, right, the Democratic candidate for governor.
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Sen. Bernie Sanders, I-Vt., speaks at a rally demanding presidential action to raise the minimum wage to $15 an hour. Sanders will run to Hillary Clinton's left, trying to elevate economic issues.
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Former Secretary of State Hillary Clinton speaks at the Clinton foundation's Clinton Global Initiative conference with her husband, Bill, and daughter, Chelsea, looking on.
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Hillary Clinton addresses the Pennsylvania AFL-CIO three weeks before the Democratic primary contest against Barack Obama. Seated at right is Pennsylvania AFSCME President Gerald W. McEntee.