Who controlled congress until 2006? A rhetorical question , I know.
Shortly after [Vermont] Sen. Jim Jeffords switched parties [in 2001], giving the Democrats a one vote majority after it had been tied 50-50, there were some Republican filibusters, she said. Jeffords made Sen. Tom Daschle the majority leader and he forced the Republicans to actually filibuster some judicial nominees.
The Senate, as of the pre-election 108th Congress, was composed of 51 Republicans, 48 Democrats, and 1 independent. (The independent, Jim Jeffords of Vermont, was allied with the Democratic caucus and had voted with Democrats to give them the majority in the past.) The Democrats, therefore, needed to make a net gain of at least two seats from retiring or incumbent Republicans to gain control of the Senate. In the election, incumbent senators won reelection in all races but one (Democratic leader Tom Daschle, in South Dakota, lost to Republican John Thune). The seats of retiring senators were taken by the opposing party in Colorado, Florida, Georgia, Illinois, Louisiana, North Carolina, and South Carolina. In fact, the only retiring senator whose seat was taken by a member of his party was Republican Don Nickles of Oklahoma, who was succeeded by Tom Coburn.
Republicans gained four seats in the 2004 elections, and entered the 109th Congress with a 55-44-1 lead. While such a majority is formidable, it is still less than the 60 seats needed to override a filibuster and completely control the body’s agenda and procedures.