The White House and Sestak are stonewalling questions from the media, and obviously, a Democratic controlled Congress is not about to go poking around asking about the proposed deal.
So how could the Republicans break it open?
The weak link here is Sestak himself, who claims that he embraces "transparency." Fueled by his primary victory and the momentum it generated, Rasmussen has him four points ahead of Pat Toomey, the GOP candidate. This lead won't hold up for long in the face of a refusal to respond to questions the public is entitled to have answered.
Toomey or the Republican Party or other independent expenditure groups should run ads throughout Pennsylvania asking these basic questions. They should tell Sestak that he ran on a platform of transparency and that its time to reveal who offered what and when.
Either Sestak is lying and there was never an offer, or the White House has skirted very close to having committed a crime or may have stepped over the edge. And, considering the stakes and the nature of what the offer would have had to have been, this scandal could reach very high indeed.
Is it a high crime and misdemeanor to offer someone something of value in return for withdrawing from a U.S. Senate race? We may be about to find out.