The correct answer to this open question is the following.
The events in the first two years of Bush's second term that contributed to Republicans losing control of Congress were that the opposite party, the Democrats, controlled the majority of both houses of Congress: the House of Representatives and the Senate. That was the time when representative Nancy Pelosi became the first woman to be the Speaker of the House(today, Pelosi is again the Speaker of the House). The fact that the Democrats controlled the Congress, made it difficult for Bush to pass some legislation.
