Philly key in Primary

With the Pennsylvania primaries coming up, it could certainly make or break campaigns. Pennsylvania is a large and diverse state that offers Sen. Hillary Clinton and Sen. Barack Obama distinct demographic advantages.

It might be Clinton's last chance, who trails Obama by 144 delegates, with more than 4 million democratic voters in the state of Pennsylvania. Philadelphia, the states most populous city, is a big key to winning the primary.

A win for Clinton might giver her the momentum she desperately needs to continue her campaign or Obama could leave Clinton behind in the dust if he can manage a strong African-American vote, which is over half of the Democratic primar electorate.