Conservative group American Energy Alliance (AEA) launched ads Wednesday accusing Sen. Kay HaganKay Ruthven HaganInfighting grips Nevada Democrats ahead of midterms Democrats, GOP face crowded primaries as party leaders lose control Biden's gun control push poses danger for midterms MORE (D-N.C.) again for supporting a carbon tax.
The $230,000 ad buy is the second one from AEA hitting Hagan, who is up for reelection this year.
The ad alleges Hagan lied when saying she opposed a carbon tax after the group's first ad ran last year.
Showing footage of Hagan backing the president's Affordable Care Act, the ad states: "We all know politicians don't always tell the truth."
"Now she's at it again. Hagan's campaign claims she opposes a carbon tax but she is on record supporting it -- worked to make it a priority," the 30-second TV and digital ad buy states.
AEA bases its claim on a letter Hagan signed in 2010 with a group of Senate Democrats calling on Senate Majority Leader Harry Reid (D-Nev.) to move on energy legislation, specifically a "comprehensive solution that includes a price on greenhouse gas emissions."
The ad also claims such a tax would "destroy North Carolina jobs" and "cost the average family over $2,000 a year."
Hagan has said she opposes a carbon tax despite her votes against an amendment offered by Sen. Roy Blunt (R-Mo.) last year that would have blocked the tax.
But Hagan also voted against Sen. Sheldon Whitehouse's (D-R.I.) nonbonding amendment which would have returned revenues from an fee on carbon pollution to the public.