Sen. Arlen Specter (D-Pa.) isn't worried about securing President Barack Obama's help on the campaign trail this fall.

Specter appeared on Monday with Obama at Arcadia University in Glenside, Pa. When Specter switched parties last year, the president agreed to stump for him.

If he wins the May 18 Democratic primary against Rep. Joe Sestak, Specter will face former GOP Rep. Pat Toomey this fall in a rematch of the 2004 GOP primary. Most polling has shown Toomey ahead, though a March 2 poll by Quinnipiac University put Specter ahead of Toomey, 49-42.

In a brief interview this week, Specter told The Hill that Obama has already been supporting him.

Q: What conversations have you had with the president about campaigning for you?

A: "He's already been to Pennsylvania. He campaigned for me and helped me raise money. My being with him yesterday has political benefit. He invited me to go with him. I've gone to Pennsylvania with him before. He's invited me to the White House -- I was with him today for the Greek reception."

Q: Does he plan to campaign for you again anytime soon?

A: "I think he will. We haven't planned specific dates, but he's been very helpful."

Q: How did the conversation go with him when you switched parties? What did he promise to do for you?

A: "I'm not going to discuss that. It was a private conversation with the president."