Hillary Clinton
U.S. Democratic presidential candidate Hillary Clinton poses for photographs with supporters during a campaign event in Indianapolis, Indiana, United States, May 1, 2016.Reuters

The remaining five presidential candidates are a mere day away from the all important Indiana primary on 3 May. Party frontrunners Hillary Clinton and Donald Trump are coming off a series of victories on 26 April and are a couple hundred delegates away from clinching their respective party's nominations.

Republicans (57 delegates)

Republicans will have a chance to win all 57 delegates during the primary on 3 May, as the GOP adheres to a winner-take-all system in The Hoosier State. Recent polls reveal Trump is firmly in the lead by as much as 15 percentage points. The May poll by NBC News/WSJ/Marist places the bombastic real estate mogul ahead of Texas Senator Ted Cruz, 49% to 34%. Ohio Governor John Kasich, meanwhile, earns a paltry 13%.

A win in Indiana would only push Trump that much closer to winning the GOP nomination. Trump leads in delegate count with 996 delegates, followed by Cruz with 565 and Kasich with 153. Republicans need 1,237 delegates for the nomination. If Trump wins, he would be propelled over the 1,000 delegate threshold.

Democrats (83 delegates)

The two Democratic candidates have a chance at 83 delegates, which will be awarded based on a proportional system. The recent NBC News/WSJ/Marist poll finds Clinton ahead of Vermont Senator Bernie Sanders by four points, 50% to 46%. Previous April polls consistently show Clinton ahead by as much as 13 points and by as little as three points.

With the polls showing Clinton and Sanders so close, Indiana could really be a flip between the two candidates. Regardless of who wins, both candidates will likely take roughly the same amount of delegates, pushing Clinton ever closer to the Democratic nomination. The former secretary of state has 2,165 delegates — with superdelegates included — compared to Sanders' 1,357 delegates. Democratic candidates need 2,383 delegates for the nomination.

Polls will open as early as 6am EDT/11am BST and will close at 6pm EDT/11pm BST.