Democrats have retained and expanded their control of the Senate, picking up at least four seats now held by Republicans in Tuesday's election.
Democrats, who now exercise slim 51-49 control of the chamber, have ousted incumbent Republican Sens. Elizabeth Dole in North Carolina and John Sununu in Hampshire in their march to solidify leadership. They also have won two other seats held by retiring GOP senators in Virginia and New Mexico.
With 21 of 35 Senate races called, Democrats are now guaranteed at least a 52-28 majority, including two holdover independents who vote with Democrats.