PHILADELPHIA, Pennsylvania (CNN) - The fate of the battle for the Democratic presidential nomination may be on the line Tuesday as voters head to the polls in Pennsylvania's primary.
Polls opened at 7 a.m. ET and will close at 8 p.m. in the state, which has 158 delegates at stake.
Sens. Hillary Clinton and Barack Obama both would love to come out of Pennsylvania with a win, but most political analysts agree that a victory is crucial for Clinton.
Obama leads in the delegate count, the popular vote and the states won so far this primary season. If Clinton is victorious, it would allow her to make a small dent in Obama's lead, and more.