CHICAGO (CBS) – Spending on political ads spiked in the final days of the campaign, surging to $2.8 million a day in November, TV industry sources say.

For TV watchers, the deluge of political ads was a lot more than they saw in the previous month, when average daily spending was around $1 million.

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The spending caught the experts by surprise, with the late tsunami spent on state legislature races.

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Sources say, House Speaker Mike Madigan and Senate President John Cullerton unleashed a boatload of cash to support Democrats.

And the Liberty Principles PAC run by radio host Dan Proft and funded businessman Richard Uihlein, spent heavily to support conservative Republicans.

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Both sides waited until late in the campaign so their messages didn’t get drowned by ads from the governor’s race between Bruce Rauner and J.B. Pritzker.