Rich Beeson, part of the 2012 Romney team, has joined Rubio's Reclaim America PAC.
Incumbent Sen. Alexander is expected to win his primary Thursday.
Brutal GOP primary gives Democrat Michelle Nunn an opening
They say Obama’s unpopularity and their tech advances put them in good midterm position.
Voters go to the polls in Arkansas, Maine, Nevada, North Dakota, South Carolina and Virginia.
Here's how you can tell.
If the numbers hold, Ernst would be able to lock up GOP's Iowa Senate nomination.
Sen. Marco Rubio is heading to Iowa next week to bolster the Senate campaign of Joni Ernst.
She told voters to ignore photo scandal as she stumped for Chris McDaniel's Senate bid.
Cruz's presence was felt up and down the GOP primary ballot.