Why final push by Braun, Donnelly could determine party control of U.S. Senate

As the song goes, you ain't seen nothing yet.

Sen. Joe Donnelly and Republican Mike Braun already have blitzed Indiana with campaign stops, political advertising and big-name rallies. But in the final push toward Election Day, the airwaves are about to get even more crowded with campaign commercials touting and bashing the two candidates.

With party control of the U.S. Senate at stake, the money will continue to flow and the national spotlight will continue to shine on Indiana's pivotal race. The candidates and outside groups have committed $36.4 million on advertisements for Sept. 30 to Nov. 6, among the highest in the nation's Senate races, according to a USA TODAY analysis of data from Kantar Media/CMAG.

Republican insiders believe President Donald Trump and Vice President Mike Pence will return to Indiana in the coming days to stump for Braun. The administration needs the state to deliver another win and Republican insiders say Pence would be loathe to let Indiana's Senate seat stay blue.

Donnelly, on the other hand, seems likely to continue to shy away from big-name liberals, as he did when Sen. Bernie Sanders campaigned in Bloomington earlier this month. Expect Donnelly, who campaigned in Indianapolis that day, to crisscross the state in his 16-year-old RV while name dropping Republicans he's worked with, including Trump himself.