Still, the Democratic Party chairman, John Walsh, said the party has a wide pool of candidates and attributed Brown's loss to a rejection of his voting record.
"I don't think Scott Brown is any kind of prohibitive favorite," Walsh said. But he'd "certainly be a front-runner."
If there is a special election, whoever wins shouldn't get too comfortable. The senator will face re-election in 2014, when Massachusetts voters will endure yet another Senate election.