Sen. Rand Paul will be delivering the 'tea party' response to Obama's state of the union address. He could overshadow the official Republican response, given by Sen. Marco Rubio.
GOP strategist Karl Rove launches a group to back candidates it sees as most electable, reports say. Tea party groups and others are crying foul.
The GOP response to news that former Republican Gov. Charlie Crist of Florida backs President Obama is a time-tested one for such occasions: question the turncoat's motive.