From this report, it appears that the GOP firmament is lining up behind Arkansas Senate candidate Gilbert Baker, who is running in a hotly contested GOP primary. This is despite a promise from Sen. John Cornyn, chairman of the National Republican Senatorial Campaign Committee (NRSC) that the party would not get involved in primaries.

The AP got hold of  a fundraising invitation (not in our database yet) for November 19 at NRSC headquarters, that shows Cornyn as a host of the event, along with Senators Chuck Grassley of Iowa, Mitch McConnell of Kentucky, and David Vitter of Louisiana.

An NRSC spokesman told The Atlantic’s Marc Ambinder that Cornyn is participating in the event in his personal capacity as a senator, not as chairman.

As the 2010 elections heat up, it will be interesting to see how fundraising invitations offer clues to other contested primary races, such as the one in my neighborhood pitting incumbent Sen. Michael Bennet against challenger Andrew Romonoff, as well as the battle between Sen. Arlen Specter and Joe Sestek in Pennsylvania.

(hat tip to Micah Sifry)

If you’re still in town, there’s a relatively cheap opportunity to schmooze chiefs of staff for several powerful GOP senators tomorrow at a “Dog Days of Summer Cookout” benefiting the National Republican Senatorial Committee’s offices.

The cost is just $100 per individual–a bargain compared to most fundraisers we document here at Party Time–and the attire is casual.

The chief-of-staff lineup includes Jackie Cottrell, who works for Sen. Pat Roberts (R-KS); Rick Dearborn, for Sen. Jeff Sessions (R-AL); Beth Jafari, for Sen. John Cornyn (R-TX); Billy Piper, for Sen. Mitch McConnell (R-TX); T.A. Hawks,  for Sen. Thad Cochran (R-MS); Kyle Ruckert, for Sen. David Vitter (R-LA); Michael Schwartz, for Sen. Tom Coburn (R-OK); Ryan Thompson, for Sen. James Inhofe (R-OK); David Young, for Sen. Chuck Grassley (R-IA); and Matt Zabel, for Sen. John Thune (R-SD).