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RED OAK, IA - NOVEMBER 04:  Voters get an 'I VOTED TODAY' sticker after casting their ballots on election day at the Red Oak Fire Department November 4, 2014 in Red Oak, Iowa. According to the polls, Republican U.S. Senate candidate Joni Ernst is in a neck-and-neck race with Democratic candidate Rep. Bruce Braley (D-IA), and the election in Iowa could decide which party controls the U.S. Senate.  (Photo by Chip Somodevilla/Getty Images)
RED OAK, IA - NOVEMBER 04:  Voters get an 'I VOTED TODAY' sticker after casting their ballots on election day at the Red Oak Fire Department November 4, 2014 in Red Oak, Iowa. According to the polls, Republican U.S. Senate candidate Joni Ernst is in a neck-and-neck race with Democratic candidate Rep. Bruce Braley (D-IA), and the election in Iowa could decide which party controls the U.S. Senate.  (Photo by Chip Somodevilla/Getty Images)

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Elections expected to be most expensive

The 2014 U.S. midterm elections are projected to be the most expensive in the nation's history.

Elections expected to be most expensive

The 2014 U.S. midterm elections are projected to be the most expensive in the nation's history.