Joe Sestak will formally announce his candidacy for the U.S. Senate today.

“The race will turn out the way it should,” he said. “I intend to win — period. Failure is not an option.”

Sestak has been taking time away from his job as a congressman to promote himself to local Democratic leaders across the state.

In the meantime, the man he accuses of not being a real Democrat, Arlen Specter, has been out on the stump trying to sell the party's growingly unpopular reform of the nation's health care system and taking his lumps in the process.

So who is really being the loyal Democrat here?

UPDATE: BTW, the Admiral is wrong. Failure is always an option. It's just not the most attractive option for him.