With control of Congress at stake, politicians are aggressively taking to the airwaves. Through mid-October, the number of television campaign commercials was up 31 percent compared to the same period four years ago, a report released Thursday found.

Nielsen Monitor-Plus counted 942,900 political ads running between August 1 and Oct. 15. That doesn't even take into account the last week before the Nov. 7 election, when advertising is at its heaviest.

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