Republican Mike Braun defeats Sen. Joe Donnelly in Indiana

Sen. Joe Donnelly (D-IN) speaks with the media ahead of the vote
Sen. Joe Donnelly (D-Ind.). Photo by Aaron P. Bernstein/Getty Images

Republican Mike Braun has defeated incumbent Senator Joe Donnelly in Indiana.

Why it matters: Donnelly has lost in a key red state, making any chance of Democrats taking over the Senate even slimmer.