Henry A. Wallace
Joe Lieberman is a former US Senator from Connecticut and former member of the Democratic Party. He was the Democratic Party nominee for the Vice President in 2000.
Andrew Johnson 1865
The former democratic mascot is a rooster
Bill Clinton's role in Hillary Clinton's campaign is he, as a former president, tries to draw supporters to Hillary Clinton.
The Democratic Party's representative in the 1852 United States Presidential Election was Franklin Pearce, who went up against Whig candidate Winfield Scott - who won a bitter campaign to become the Whig Candidate between himself, Millard Fillmore, the President at the time, and Daniel Webster, a former Massachusetts senator.
Former Senator and now Vice President Joe Biden.
The democratic nominee for president in the 1864 election was George B. McClellan. McClellan was a former Union general during the Civil War and ran against the incumbent president, Abraham Lincoln.
Walter Mondale, former VP from Minnesota ran for the Democrats against Reagan in 1984.
Bill slick Willie Clinton
Former First Lady Hillary Rodham Clinton, wife of former U.S. President Bill Clinton, ran against Barack Obama for the 2008 Democratic Party Presidential Nomination. She served as U.S. Secretary of State under Pres. Obama from 2009 to 2013.
If you are asking about current day (2016), the remaining two Democratic primary candidates are former First Lady and former Secretary of State Hillary Rodham Clinton, and current US Senator from Vermont Bernie Sanders.
The Republican nominee was General Dwight D. Eisenhower of New York, and the Democratic nominee was Illinois Governor Adlai E. Stevenson II (son of former Vice President Adlai E. Stevenson I).