As polls in various states close, all eyes are on key battleground states.
So far Sen. Barack Obama has swept traditionally Democratic states across the East, including wins in the battleground states of Pennsylvania and Ohio.
Meanwhile, Senator John McCain continued to hold his ground in solid GOP territory.
Virginia, Indiana and Nevada are also too close to call. For Obama, victory in any of the three could signal a big win - possibly a landslide.
Neither senator took anything for granted, as both candidates launched a last minute 10-state blitz in their quest for the White House. Today, McCain hit the road in Colorado and New Mexico, while Obama campaigned in Indiana.
"America is worth fighting for. Nothing is inevitable here," the GOP nominee told supporters at a Colorado rally. "I feel the momentum. I feel it, you feel it, and we're going to win the election,"
Obama told voters in Indiana, "Call up some of your friends, cousins make sure everyone's going out even if there's a long line."
Sources: ABC News, The Associated Press