US Representative Barney Frank

Warchest: $821,813

Chance of running: Almost nil. He said in an interview “there’s zero chance I would take another job.”

Pro: Is one of the most well known Massachusetts congressmen, and would automatically be a front runner.

Con: As chairman of the Financial Services Committee, he has one of the most powerful roles in Washington. Trading that power to become a freshman senator doesn’t have a lot of appeal.