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Rep. Joe Sestak, the Democratic nominee for Senate, has purchased air time for TV commercials in select markets of Pennsylvania beginning Tuesday through Sept. 6, after enduring weeks of attack ads by his Republican opponent without answering directly.

Sestak’s campaign has booked at least $110,870 worth of time on broadcast and cable television in Harrisburg, Pittsburgh, Johnstown and Wilkes-Barre, according to sources who track media buys. About 91 percent of the money will be spent on brodcast; the cable buys are mostly for spots during Phillies games and the Penn State football opener.