The scandal surrounding Sen. Craig's expected resignation adds to the difficulties the GOP faces in trying win back control of the Senate in 2008.

From The Washington Post:

Craig's resignation would not affect the makeup of the Senate, because Idaho's governor is expected to appoint another Republican to the seat. But the scandal adds to the difficulties that the GOP faces in trying win back control of the Senate in next year's elections, in which they will have to defend 22 seats, including that of Sen. John W. Warner of Virginia, who announced yesterday that he will retire when his term ends in 2009.