Republican challenger Kristi Noem has defeated Democratic Rep. Stephanie Herseth Sandlin to claim South Dakota's lone seat in the U.S. House.

Herseth Sandlin had won her two previous re-election bids by wide margins but faced a tough challenge from Noem in a race that drew a lot of advertising from political parties and interest groups.

The 39-year-old Herseth Sandlin sought a fourth full term in Congress as she argued she has fought against excessive spending by voting against bailouts and the health care law.

The 38-year-old Noem has been a state lawmaker for four years. She criticized Herseth Sandlin for being part of a Democratic Congress that she said has let spending get out of control while failing to revive the economy.