And now the tallying begins...

Monday was the last day to register to vote before Election Day, which means today state officials are starting to tally up the new registrants.

While the exact numbers won't be clear until the end of the month, Democrats are likely to see their registration edge in the state increase. They already outnumber GOP voters by more than 1.1 million voters.

How much greater that advantage gets could go a long way in determining John McCain's chances of taking the state's 21 electoral votes away from currently leading Barack Obama.

But with new voters tending to overwhelmingly favor Obama, it's no wonder Republicans in the state are worried that Pennsylvania is slipping away from the GOP nominee.

Stay tuned.