<I>What is the current makeup of the U.S. Senate? How many are Democrats? How many are Republicans? How many independents? How many seats are up for election? How many open seats? How many Democratic incumbents and how many Republican incumbents?</I>
According to the Documents Room of the U.S. Senate, there are 54 Republicans and 46 Democrats in the Senate. There are no independents. Of the 100 senators, one-third are up for election every two years. Every third election, 34 seats are up for election.
This year, 33 senators face elections; 19 are Republicans and 14 are Democrats.
Four Democratic seats are open races. One Republican seat is open. That means 18 Republican and 10 Democratic incumbents are running for re-election.