Lamar Alexander, the two-term Republican senator from Tennessee, is in a strong position to win reelection this November. But only if he can get through his August 7 primary.

Polling has been scarce in the race between Alexander and his GOP primary challenger, state representative Joe Carr, though the incumbent enjoys advantages in fundraising and name recognition (Alexander twice served as governor in the 1980s). An independent poll in January found Carr down by 40 points.