Both the Clinton and Trump campaigns here in Philadelphia tell us they must win Pennsylvania in order to win the White House.
That said, it explains why both of the candidates and their surrogates are investing so much time here in the next five days.
Volunteers at phone banks for Hillary Clinton were expecting to make more than 1 million phone calls to Pennsylvania voters in the waning days of the campaign.
"We're getting out the vote, the votes are out there, just some people need a little reminding," said Jack Davis, Clinton volunteer.
In Newtown, Bucks County, volunteers for the Trump campaign were doing the same.
The Real Clear Politics latest average of polls now shows Clinton leading in Pennsylvania by only 3 points, and that has Trump volunteers fired up.
"We have the momentum. I've spoken to a lot of people in my community, and they're not voting for Hillary," said Daphne Goggins, North Philadelphia Ward Leader.
Philadelphia Republicans gathered Thursday night at Dave & Busters believe the FBI's latest Clinton investigation on her emails may be a game changer.
"I think we're gonna see a strong showing out of the city of Philadelphia, much better than we've done probably in the previous three decades. I think we'll hold it tight in the counties, and we'll really blow it out up out west enough to give us the state," said Joe DeFelice, Republican City Committee Chairman.
The Democratic City Committee Chairman begs to differ.
"We've gotten 450-plus majority for every president since 30 years that I've been here, and there's no reason why we can't get more now," said Rep. Bob Brady (D-Pennsylvania).
In fact, the Democratic congressman believes Trump's own antics has done more to help fire up Democrats.
"We are fired up. He couldn't help us anymore," said Brady.
Clinton, Trump campaigns pull out all stops in fight for Pa.