http://adage.com/article?article_id=122803
With presidential caucuses set for next Thursday, candidates have bought every local spot in ABC’s telecast of the game on Des Moines station WOI-TV. That’s 10 30-second spots, some of which are being combined for 60-second messages.
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TV-station and cable execs say candidates’ last-minute buys combined with the usual post-Christmas slowdown in other ad categories means far more Iowa TV spots are political ads. Even when nonpolitical advertisers do want in, in some cases federal requirements give precedence to the political spots, meaning some regular advertisers get pre-empted.

