Fall River, Mass.

'I don't consider myself a tea party candidate," Sean Bielat tells me over dinner. "I don't know what it means." But an hour later Mr. Bielat, Rep. Barney Frank's Republican challenger, receives a hero's welcome at the Spindle City Tea Party, a gathering of nearly 200 citizen- activists in this economically depressed mill town. As he approaches the stage, they stand, applauding and chanting "Go, Sean, go!"

What...