Sen. Mark Pryor (D-Ark.) is getting hit from all sides.

The same week that a pro-gun control group launched a new ad campaign targeting Pryor from the left, a GOP group is launching a new ad that labels Pryor a "liberal" who supports President Obama.

The ad is from the Senate Conservatives Fund, which was formerly allied with former senator Jim DeMint (R-S.C.) and has taken an active role in GOP Senate primaries in recent years.

The buy is for $320,000, according to SCF -- a significant purchase in Arkansas.

Republicans of many different stripes are trying to lure freshman Rep. Tom Cotton (R-Ark.) into the race.

Pryor has also reportedly begun buying airtime himself.