Politics confusing? Yup
Heading into the election, the Republican Party holds a 52 seat majority in the Senate. Democrats hold 46 seats, and the remaining two are held by independents who caucus with the Democratic Party. The Democratic Party is on the defensive in 2018, as they are left defending 25 seats (two of which are held by independents), while only eight seats up for election in 2018 are held by Republican incumbents. The Democratic Party is further weakened by having to defend seats in a number of states which supported Donald Trump over Hillary Clinton in 2016.