But John McCain is "proud" of his supporters.
After threats at several field offices around the state, Sen. Barack Obama's campaign is asking labor unions to help provide volunteer security at 27 offices between now and Election Day.
The Obama campaign has 81 offices across the state. Of the 17 in Philadelphia, they want security at six, according to an e-mail sent to union leaders.
The e-mail said there have been threats at three Philly offices. That's on top of an evacuation this week at the South Philly office after they received a threatening letter that contained a suspicious substance, which initial tests determined was sugar.