Internal Poll Suggests Hastert Could Devastate GOP

House Republican candidates will suffer massive losses if House Speaker Dennis Hastert remains speaker until Election Day, according to internal polling data from a prominent GOP pollster, FOX News has learned.

"The data suggests Americans have bailed on the speaker," a Republican source briefed on the polling data told FOX News. "And the difference could be between a 20-seat loss and 50-seat loss."

Most GOP lawmakers have stood by Hastert, pending a full airing of the facts in his handling of the Mark Foley affair, in which the former Florida representative was caught exchanging salacious messages with teen pages in Congress. The new polling data, however, suggests that many voters already have made up their minds.