READING, Pa. -

The fight for the White house has been kicked into high gear. We're four days out from the election, and Pennsylvania is back in focus.                                                     

A few months ago, Pennsylvania was considered an easy win for President Barack Obama. Now, according to the polls, Mitt Romney has closed the gap.

It's game on, and both parties were working around the clock Friday to capture the commonwealth.

"Just reaching out to registered Democrats to make sure they know where their polling place is," said a volunteer at Obama's camp in Reading, who placed calls Friday to voters.

An added intensity could be felt inside both President Obama's and Gov. Romney's headquarters in Berks County.

"OK, well thank you for your support. Your vote is very important to us," said a GOP volunteer, who made calls for Romney.

The finish line is in focus, and over the next few days the campaigning is being amplified.

"We have volunteers going out knocking on doors, volunteers talking on the phone," said Elijah Rhodes, a neighborhood team leader for the president.

"People are beginning to close the deal, and that's what we're finding right now," said Mark Gillen, the former Republican chairman in Berks County.

Pennsylvania is back in play with 20 electoral votes up for grabs. If you believe the polls, Obama's lead is gone, and the super PACs have recently pumped millions into ads in the commonwealth.

"There are no opportunities for the governor in Pennsylvania. Period," said Rhodes.

Obama's camp called this weekend, "show and tell." Supporters said the president has a better ground game in Pennsylvania, but both political pundits and the Berks GOP have not written Romney off.

"We have 400,000 people that live in Berks County, and there's still many that need to be reached," said Gillen.

According to pundits, Obama needs Pennsylvania to win. With Romney forcing the president to defend the commonwealth, that opens the door for Romney to close the gap in key states like Ohio.

Romney is expected to add more pressure by visiting Pennsylvania on Sunday. He'll make a campaign appearance at Shady Brook Farm, 931 Stony Hill Rd., in Lower Makefield Twp., Bucks Co.

Doors will open at 2:30 p.m. The event will start at 5:30 p.m., and the governor is expected to arrive around 6 p.m.

Free tickets must be obtained online. One ticket per person, and IDs will be checked at the door. The name on the ticket must match the name on the ID.

Romney's running mate, Paul Ryan, is scheduled for a visit on Saturday. He'll be at the Harrisburg International Airport, 517 Airport Dr., in Middletown on Saturday. Doors will open at 11 a.m. The event will begin at 1 p.m.