The primaries in Wisconsin and Washington, along with the caucus in Hawaii will take Tuesday.
For the Democrats, Sen. Barack Obama (D-IL) is expected to take his home state of Hawaii, but Sen. Hillary Clinton (D-NY) has been campaigning hard throughout to ensure that he does not.
Obama currently leads the Democrats with 1,262 delegates, trailed closely by Clinton with 1,213. The Democratic presidential candidates need to reach 2,025 in order to secure the party's vote.
Obama has won the last eight primary/caucus elections.
Sen. John McCain (R-AZ) leads the Republicans with 830, followed former Arkansas governor Mike Huckabee with 217.
McCain has received some key endorsements over the last week in former presidential candidate Mitt Romney and former President George H. Bush, the father of current President George W. Bush.
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