When Seth Moulton launched a primary challenge to longtime Democratic congressman John Tierney, most self-appointed political experts said he had no chance to win. But earlier this month, Moulton proved them wrong, besting Tierney by a surprisingly wide margin.

Now, many of the same prognosticators who dismissed Moulton's chances against Tierney are saying he’s the odds-on favorite to beat Republican Richard Tisei in November. But as Moulton knows firsthand, in the world of politics, predictions don't count for much.