Wherefore art thou Doc Block?

Last night, MSNBC began re-airing the David Gregory's Race for the White House at 11pmET. Two months ago, the network replaced the 10pmET Doc Block hour with a re-air of Countdown, which means the documentary programming has once again disappeared from the MSNBC prime time schedule.

Insiders tell us, it may only be temporary if the numbers drop off.

Last night the Gregory show came in third fourth, behind AC360, the O'Reilly re-air and Showbiz Tonight. Monday's Memorial Day doc block marathon did not fare so well, either. MSNBC came in a distant third in the demo, and fourth behind HLN in Total Viewers in prime time.