US President Joe Biden's Democrats have gotten one step closer to maintaining Senate control.
The Senate would then consist of 49 Democrats and 49 Republicans.
Only Nevada and Georgia are still up for debate.
While Georgia's contest will be decided by a run-off election next month, the vote count in Nevada is close.
Democrats will continue to hold a majority in the upper chamber of Congress if they prevail in either of the two remaining contests
The House of Representatives and the Senate, the two chambers of Congress, are up for election in the midterm elections.
The Senate can confirm presidential appointments, block or approve bills, and open investigations into the president.
Every two years, during the president's second year of a four-year tenure, these polls are held.
Two senators from each state serve six-year terms in the Senate.
Representatives represent smaller districts and are elected for two years.
In addition to one-third of the Senate, every seat in the House of Representatives was up for election at the midterm elections.
Governor and municipal official elections are also held in a number of large states.
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