10/31/2008 03:07 pm ET | Updated May 25, 2011

Obama Rouses Supporters in Pa. as Authorities Investigate Threats

Swing state Pennsylvania may decide who will be the next president of the United States.

"We have built the largest grassroots organization in Pennsylvania history," said Sean Smith, Director of Communication for the Pennsylvania campaign offices of Barack Obama. "We have 81 field offices opening across the state."

They have been busy, especially registering voters for change. There are currently, 500,000 more Democrats registerd in the state than there were four years ago, according to Smith.

Senator Obama has made several stops here, recently, and most spectacularly at Widener University in Chester. The rainy day rally drew a crowd of diehard supporters. The city hadn't been visited during a presidential campaign since 1980 when President Ronald Reagan arrived.

"I've been following Obama. His speaking ability was phenomenal, though he shortened his speech because it was cold. It was difficult to take in the experience because the other speakers weren't that loud," said Ryan Jones, a 3rd year Law Student at Widener Law.

Recently, another Obama assassination plot was stopped. Two neo-Nazi skinheads planned to assassinate Obama and shoot and decapitate 102 black people with stolen firearms and explosives according to federal agents who released statements to the press.

"They said that would be their last, final act -- that they would attempt to kill Sen. Obama," Jim Cavanaugh a special agent told the Associated Press.

The issue of race has been coming up now more than ever in the election.

"I can believe that his life is in danger because of his color. I just don't feel like he is going to win because they will find a way to fix it," said Carrie Godson of Chester, Pa.

In Pennsylvania, a threatening letter was reported from the South Philadelphia office. The incident is still under investigation though the substance contained in the letter, a powdery substance, seemed harmless.

"The letter was somewhat threatening in nature, and it contained a substance that we believed to be a hazmat," Philadelphia police Capt. Mike Gillespie told Fox29 News.

Sean Smith was unable to comment on the South Philadelphia incident.