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About one-third of the Senators in Congress are elected every two years. This means the 33 are up for election at any one time.
Going into the elections, there were 53 Democratic, 45 Republican and 2 independent senators (both of whom caucus with the Democrats). In all, there were 36 elections: 33 senators were up for election this year as class 2 Senators, and 3 faced special elections (all from Class 3).Of all these seats, 21 were held by Democrats and 15 were held by Republicans. Colored shading indicates party with largest share of that row.n all, there were 36 elections: 33 senators were up for election this year as class 2 Senators, and 3 faced special elections (all from Class 3). Of all these seats, 21 were held by Democrats and 15 were held by Republicans. Colored shading indicates party with largest share of that row.