Political ads offer a hint of what's to come for Indiana in 2018

Sen. Joe Donnelly

A hint of what's to come. A year and a half ahead of a major vote in the 2018 midterm elections, political ads are arriving on your screens.

Political Action Committee "Majority Forward" is airing a spot highlighting the work of Senator Joe Donnelly.

Donnelly faces re-election next year in what could become one of the most closely-watched races in the country.

At stake -- control of the Senate.

Republicans Luke Messer and Todd Rokita have hinted at challenging Donnelly.

At this point, neither have made official announcements.