It's Democratic incumbent against Republican 'Washington outsider.'
At Sunday's televised debate of U.S. Senate candidates in the Republican primary, the three hopefuls were quick to start slinging mud at each other -- and incumbent Joe Donnelly.
As eyes across the country are watching how the Indiana Senate race unfolds, we dive into what makes it so important to the rest of the nation.
Who are businessman Mike Braun, and U.S. Reps. Luke Messer and Todd Rokita? Republican voters will chose one of them to try to unseat Democrat U.S. Sen. Joe Donnelly.