Did Senator Pat Toomey just have his 'Rick Santorum endorses Arlen Specter' moment?

In 2004, then Senator Rick Santorum (R-PA) endorsed incumbent Arlen Specter over Pat Toomey. It was a contributing factor to Santorum's loss to Bob Casey in 2006. In 2010, the showdown between Toomey and Specter began anew. With Tea Party support, Toomey won.

Last month, during Rand Paul's now famous filibuster, Toomey was one of several Republican Senators who dined with Barack Obama as Paul ate candy bars.

Now, in what appears to be an effort to prevent a filibuster on gun control, Toomey and Senator Joe Manchin (D-WV) have come together on a compromise bill. As news begins to trickle out, what initially seemed like an inexplicably bone-headed decision by Toomey to reach across the aisle is now no less boneheaded but a little less inexplicable.

Via the Daily Caller:

New York mayor Michael Bloomberg’s anti-gun group announced Wednesday that it will stop running a negative television ad targeting Sen. Pat Toomey now that the Pennsylvania Republican has signed on to a proposal to expand background checks to gun show and online firearms purchases.

Mayors Against Illegal Guns had been hammering Toomey, a junior senator with an “A” rating from the National Rifle Association, with negative ads in Keystone State. But his latest proposal, which he is co-sponsoring with West Virginia Democratic Sen. Joe Manchin, has Bloomberg and company singing a different tune.

The coalition’s initial negative ad featured an urgent-voiced narrator who said, “Tell Senator Toomey, don’t protect criminals…Demand action now,” and displayed Toomey’s office phone number. Now the coalition is running a positive ad praising Toomey.

At first blush, it would seem that Toomey could be selling out the second amendment in the interest of getting re-elected.