WASHINGTON - Voters across Pennsylvania are showing up at the polls.
With the prolonged primary battle between Sens. Barack Obama and Hillary Clinton so close, the Keystone state may play an unusually pivotal role in determining the nominee.
Watch for more from CBN News Political Reporter David Brody, following this report. Stay-tuned to CBNNews.com for tonight's live primary coverage.
Make or Break Primary?
Today's primary in Pennsylvania is the largest of the 10 remaining contests and the stakes couldn't be any higher, which is part of the reason why the campaign has gone so negative.
It's also why Obama has had to answer charges that his "new kind of politics" looks more like old political hat.
"Somebody throws an elbow at you, and after three or four times of getting elbows in the ribs, to what point do you say, 'Ok, we've got to put a stop to that,'" Obama said.
In the final hours before voters went to the polls a new Clinton ad hit the airwaves with more negativity.
"Who do you think has what it takes?" the ad said, implying she's tougher than Obama. The ad shows historic images such as the bombing of Pearl Harbor and Hurricane Katrina and - a first for any Democratic candidate - a clip of Osama bin Laden.
The Obama campaign says the ad plays on the politics of fear.
"Senator Clinton has internalized a lot of the strategies, the tactics that have made Washington such a miserable place," Obama charged.
Clinton maintains an edge in Pennsylvania, a state with older voters, blue collar workers and fewer college graduates - demographics that work in her favor.
But in the last few weeks, polls show Obama - outspending Clinton nearly three-to-one - has cut her lead from a hefty 20-point advantage down to as low as single digits.
Needing a big win to stay in the race, Clinton made the rounds on the morning talk shows, arguing she will take a tough stand against Iran if it launched an attack on Israel.
"During the next 10 years, during which they might foolishly consider launching an attack on Israel, we would be able to totally obliterate them," Clinton said.
McCain Joins the Fray
For his part, Republican Senator John McCain has moved on to Ohio for the second day of his poverty tour. But even he had to get in on the action along with Obama and Clinton when they taped messages for wrestling fan's WWE.
In one ad McCain said, "If you wanna be the man, you have to beat the man. What you gonna do when John McCain and all his McCain-iacs run wild on you?"
If Clinton pulls out a big win tonight over Obama, it could be another two weeks before Democrats get any closer to choosing who will be in that final match-up against McCain.
The next primary contests are in Indiana and North Carolina on May 6.