Beginning at 4:30 pm ET, I will be appearing on MSNBC's "brain trust" segment hosted by Craig Melvin, talking about the ships-passing-in-the-nightness of this weeks senatorial duel between Rand Paul (R-Ky.) and John McCain (R-Ariz.). We'll also be discussing Bill Clinton's change of position (I won't say "heart") on the Defense of Marriage Act, and gazing into the GOP's electoral crystal ball.