Live returns Politico has put together an excellent returns page for all elections, with easy navigation. Bookmark it.
No exit polls: There will be no exit polls tonight, in any state.
Turnout light in Pennsylvania: Bad news for Specter, who needed less-engaged voters who had not heard of Sestak to turnout:
But Charlie Young, a spokesman for the Secretary of State, says turnout in the state, where the weather is bad today, is low.
"It's relatively light, with some higher concentrations out in the areas that have the special election for Murtha's seat," he says, referring to the battle for Pennsylvania's 12th district in the southwestern part of the state.
Philadelphia's turnout, he says, is even lighter. "There are no lines anywhere," he says.
This is born out by an official with a major union backing Specter, who says union hands doing get-out-the-vote work are reporting back that "turnout is abysmal."
"People aren't fired up about Specter," the official conceded. "It's low statewide, and then in Philly it especially sucks."
Early returns will likely favor Specter: Philadelphia, which is strong for Specter, usually posts its returns earlier than the rest of Pennsylvania. As such, Specter should take an early lead, with Sestak gaining the rest of the night.
This is an open thread. I will be live-blogging returns and numbers from Arkansas and Pennsylvania starting at around 8:30 pm eastern.