and this LA Times article also says 8pm:
http://www.latimes.com/news/politics/la-fi-abc29-2008oct29,0,7323859.storyABC only major TV network not airing Obama infomercial
It initially balked at the requested time slot but relented too late. The commercial will run on CBS, NBC, Fox and Univision tonight.
By Meg James
October 29, 2008
Democratic presidential nominee Barack Obama's half-hour campaign commercial is scheduled to run tonight on all of the major television networks -- except ABC.
The senator from Illinois this month arranged to buy tonight's 8 p.m. to 8:30 p.m. slot on CBS, NBC and Spanish-language network Univision. Fox Broadcasting joined the field after Major League Baseball agreed to delay the start time of tonight's World Series game.
Walt Disney Co.-owned ABC, however, initially balked at selling its 8 p.m. slot, saying it didn't want to bump its regularly scheduled series, "Pushing Daisies," even though the whimsical show has been struggling in the ratings.
ABC executives said the earlier decision not to accept the Obama infomercial was due to the problem of filling the second half-hour of the 8 p.m. to 9 p.m. time period -- and not for political reasons.
<snip>