Sources: BBC
A record number of electors break ranks and do not vote for their assigned candidate. Two electors from Texas vote for John Kasich and Ron Paul. Some of the electors from Washington cast three votes for Colin Powell and one vote for Faith Spotted Eagle. One elector from Hawaii votes for Bernie Sanders. 2016-12-19
Hillary Clinton is forecast to win the Democratic Party primary in Maryland, Pennsylvania, Connecticut and Delaware while Bernie Sanders wins Rhode Island. With her victory, Clinton came close to securing the number of delegates she needs to win the nomination. 2016-04-26
Voters in the U.S. state of Wisconsin go to the polls for a primary election with Ted Cruz winning the Republican Party contest and Bernie Sanders winning the Democratic Party primary. 2016-04-5
Bernie Sanders concedes the Missouri primary to Hillary Clinton, who led by 1,531 votes, 0.2 percent of those counted. Sanders says he will not ask for a recount, an option he had because the result is under the state's requirement, 0.5 percent — one-half of one percent. The Republican contest is too close to call as Donald Trump leads Ted Cruz by a similar 0.2 percent. 2016-03-17
In the Missouri Primary, media outlets have held off calling yesterday's races due to the extremely close results. Donald Trump and Hillary Clinton lead in their party's vote, but by just two-tenths of 1 percent ahead of Ted Cruz and Bernie Sanders, respectively. Missouri law states a recount may be requested if the margin is less than half a percentage point. Either Cruz or Sanders or both can request a recount. These results are unofficial, until they’re certified by the Missouri Secretary of State, which reportedly could take up to four weeks. Trump leads by about 1,700 votes and Clinton's edge is about 1,500. The state also needs to count the remaining absentee and provisional ballots; the deadline for overseas ballots is noon Friday. 2016-03-16
Tulsi Gabbard resigns as vice-chair of the Democratic National Committee and endorses Vermont Senator Bernie Sanders. 2016-02-28
Former New York City mayor Michael Bloomberg is seriously considering a possible independent presidential run if Donald Trump or Texas Senator Ted Cruz face Vermont Senator Bernie Sanders in the general election. 2016-01-23
The Democratic National Committee suspends Vermont Senator Bernie Sanders' presidential campaign's access to its national voter database after a member of his campaign staff took advantage of a software error to review Hillary Clinton's private campaign data. In response, the campaign files a lawsuit. 2015-12-18
Jeff Weaver, presidential campaign manager for Vermont Senator Bernie Sanders, says the DNC's suspending access to the Democratic voter file is part of a "pattern" of actions that suggest the DNC is not impartial. The campaign, which had notified the DNC of software problems, threatens to take the DNC to federal court if the party organization doesn't restore the campaign's access. 2015-12-18
Nominally independent Senator Bernie Sanders from Vermont announces that he will be seeking the Democratic Party nomination in the US presidential election. 2015-04-29