The Republican Party kept control of both the House of Representatives and the U.S. Senate until 2007. The Democratic Party wrested control of both houses of the 110th Congress, although by a very slim margin, especially in the Senate.
The composition of the 109th Congress (2005 - 2007) was as follows:
Senate: 44 D, 55 R House: 202 D, 231 R
The composition of the 110th Congress (2007 - ) is as follows:
Senate: 49 D, 49 R House: 233 D, 198 R
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