The eyes of voters may be focused on the 2020 presidential election, but a handful of Senate races are likely to be just as competitive, expensive and contentious.
Right now, the Senate is composed of 53 Republicans, 45 Democrats and two independents who caucus with the Democrats. In the 2020 election cycle, Republicans have to defend much more territory in the chamber than their Democratic counterparts. Of the 36 seats up for grabs in November, 23 are held by Republicans.