Republicans - 55
Democrats - 43
Independents - 2 (Caucus with Democrats)
In what turns out to be a 2008-type year for the Republicans, the GOP is able to defend all of their Senate incumbents while defeating Michael Bennett in Colorado for an overall change of R +1. Republicans are also able to successfully defend open seats in Florida, Indiana and Iowa following incumbent retirements, and a more establishment Republican candidate wins in Utah following the defeat of incumbent Mike Lee in the primary. Democrats, on the other hand, defend open seats in California, Maryland, and Nevada, and they come painfully close to a pickup in Florida.
2017 Freshman Senate Class
Mark Scheffel (R-CO)
Catherine Cortez-Matso (D-NV)
Kamala Harris (D-CA)
Eric Holcombe (R-IN)
Kim Reynolds (R-IA)
Josh Romney (R-UT)
Carlos Lopez-Cantera (R-FL)
Chris Van Hollen (D-MD)