UPDATE:
Well, obviously things have changed since this post was first published. We're encoding the clips of Rachel's live coverage of Eric Cantor's primary loss in Virginia tonight and we're stacking up more guests including Larry Sabato of the Center for Politics, Steve Kornacki, and Julian Walker from the Virginian-Pilot.
Tonight's guests include:
John Stanton, Washington bureau chief for Buzzfeed
Sam Stein, Huffington Post political editor and White House correspondent