A quick reminder that the GOP presidential candidates convene tonight in DC for a debate focused on national security (and foreign policy? or are we just doing the saber-rattling thing?). We’ve got you covered here from start to finish. Debate starts at 8 p.m. ET.

Benjy Sarlin tackles Mitt Romney’s totally deceptive new campaign ad in today’s Campaign In 100 Seconds.

Joe Lieberman demands that Google implement a system on its Blogger platform for users to flag “terrorist content.”