Republican businessman Mike Braun has ousted Sen. Joe Donnelly, Indiana's lone statewide elected Democrat. Both candidates portrayed themselves as fans of President Donald Trump during the campaign.
The GOP has dreamed of this victory since Donnelly unexpectedly beat Republican nominee Richard Mourdock in 2012, after Mourdock made incendiary comments about abortion and rape.
However, few would have predicted Braun's win when he entered the race last year. The multimillionaire auto-parts magnate was a little-known state representative when he launched his bid.
But Braun used his own wealth to out-fundraise two better known congressmen during a bitter GOP primary that was fueled on personal attacks.
Indiana has elected conservative Democrats but increasingly trended Republican in recent years.