Nothing was more important to them than continued Republican control of the Senate.

Even control of the Senate might be up for grabs next year.

A few even argue that control of the Senate could be in play.

The two parties have fought intensely over control of the Senate for four years.

Obviously, each party aims to take control of the Senate.

Republicans need to win one more seat to regain control of the Senate.

Republicans also took control of the Senate for the first time in over 25 years.

He had been instrumental in his party's winning control of the Senate.

That may change with control of the Senate changing hands.

He also made it clear several times that gaining control of the Senate would be difficult.