A conservative group is taking to the airwaves in Louisiana Monday to attack Sen. Mary Landrieu (D) for supporting President Obama's judicial nominees.

"Mary Landrieu voted for every one of Obama's liberal activist judges," says the narrator of the 30-second ad from the Judicial Crisis Network.

The ad also goes after Landrieu for supporting a measure to eliminate filibusters in the Senate for most presidential nominees, a maneuver known as the "nuclear option."

"Landrieu even helped change the rules to pack a key court with new liberal judges," the narrator says.

Landrieu's campaign responded to the ad, saying the commercial cites two nominees who never received votes and were not confirmed.

"Not only is this group attacking Sen. Landrieu for reaching across the aisle to confirm judges with bipartisan majorities, but they're making yet another ridiculous claim that's already been debunked as 'false' by a leading, non-partisan fact checker," said Landrieu campaign manager Adam Sullivan.

Judicial Crisis Network is spending six figures to air the ad statewide for two weeks, a person familiar with the buy said. This is the group's second in recent weeks that targets a vulnerable red state Democratic senator. It released a commercial going after Sen. Mark Pryor (D-Ark.) last month.

Updated at 1:20 p.m.