CHICAGO (CBS) – In one of the most hotly contested House races in the country, Brad Schneider lost his House seat to GOP challenger Robert Dold.

Both national parties have poured millions into the 10th District race. Dems had hoped to hang on to a much-needed seat in the U.S. House. It was one of the most expensive House races in the nation.

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Republicans will use a Dold victory to expand their House majority and make a point to use the win as an example of the electorate’s dissatisfaction with President Obama.

Schneider appeared before his supporters shortly after 9:30 to concede.

With 96 percent of precincts reporting, Dold held a 52 percent to 48 percent advantage.

Both had been flooding the airwaves with negative ads.

In another highly watched race, incumbent Rep. Bill Foster, a Democrat, defeated Republican challenger Darlene Senger. Foster had 54 percent of the vote to Senger’s 46 percent by late Tuesday.

Foster won his first term in a newly redrawn 11th district over veteran Rep, Judy Biggert.

Dems needed to hold onto the seat to thwart other national GOP gains in the midterm.

All the other Chicago area House incumbents easily won re-election:

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Bobby Rush (D-1st) over Jimmy Lee Tillman;

Robin Kelly (D-2nd) over Eric Wallace;

Dan Lipinski (D-3rd) over Sharon Brannigan;

Luis Gutierrez (D-4th) over Hector Concepcion;

Mike Quigley (D-5th) over Vince Kolber and Nancy Wade;

Peter Roskam (R-6th) over Michael Mason;

Danny Davis (D-7th) over Robert Bumpers;

Tammy Duckworth (D-8th) over Larry Kaifesh; and

Jan Schakowsky (D-9th) over Susanne Atanus.

In another GOP win Downstate, state Rep. Mike Bost has defeated first-term Democratic U.S. Rep. Bill Enyart in southern Illinois’ 12th District.

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The district has been in Democratic hands for more than two decades but has grown increasingly conservative on social issues. It stretches from the eastern St. Louis suburbs to the Kentucky border.