But it doesn't take place in one arena, one venue or one stadium. It's "Super Tuesday," where millions of voters will take to the polls and give a major boost or put a major dent in the President aspirations of this years haul of candidates. Here is where we stand, the day before one of the biggest "Super Tuesday's" ever.
NPR Poll Finds Mixed Signals on Candidates
Voters are closely divided over the presidential race, saying they would like to see a Democrat in the White House, but picking Republican John McCain over Democrats Hillary Clinton or Barack Obama when asked about specific candidates, according to a new NPR poll.
The poll also shows 68 percent of respondents think the country is on the wrong track, and the economy is uppermost on voters' minds, followed by the Iraq war and health care.
If the election were held today, 49 percent of likely voters said they would support the Democratic candidate and 44 percent would vote for the Republican nominee, according to the poll, conducted Jan. 29-31.
However, when likely voters are asked about matchups between specific candidates, Sen. McCain holds a slight lead over either Sen. Clinton or Sen. Obama, though McCain's advantage is within the poll's margin of error.
In a theoretical match-up between Clinton and Republican former governor Mitt Romney, Clinton leads 49 percent to 44 percent.
The poll shows there would be a tighter race between Clinton and McCain, with the Arizona Republican garnering 48 percent to Clinton's 45 percent, within the poll's 3-percentage-point margin of error.
Obama would beat Romney 53-41 percent, according to the poll. But a race between Obama and McCain would be too close to call, with McCain at 48 percent and Obama 47 percent.