Republican Sen. Dean Heller is yet again being targeted by a liberal super PAC in an ad highlighting the senator's lack of a business license for his rural Nevada hay farm.

The 30-second digital ad, which features the state's senior senator riding both toy and real horses, is largely based on a February story by the Reno Gazette-Journal, which reported that Heller (until recently) had never recieved a business license or exemption for his 120-acre alfalfa hay farm in rural Smith Valley since purchasing it in 2010.

Heller's campaign told the newspaper that the farm had never turned a profit, which means it doesn't meet the state's definition of a business required to obtain a license. A spokeswoman for Heller said that the senator "went the extra mile" and applied for a sole proprietor license in February even though he wasn't "legally required to do so."

The ad, which notes that failure to obtain the license is punishable by up to $10,000 in fines (Heller wasn't fined), ends by asking viewers if Dean Heller is a "lousy farmer" or a "liar."

Nevada law requires sole proprietors to maintain a state business license, unless specifically exempted in categories including nonprofits, movie production or any person who operates a business from their home and "whose net earnings from that business are not more than 66 2/3 percent of the average annual wage." State law still requires exempted businesses to submit business license forms with the state without the fee attached. Heller's office didn't answer questions from the Gazette-Journal as to why he didn't submit the exemption forms.

American Bridge 21st Century, a liberal super PAC founded in 2010, hasn't been shy about attacking Heller over the last year, releasing ads blaming him for the January government shutdown, not weighing in on Alabama Sen. candidate Roy Moore, his support for a plan to repeal and replace the Affordable Care Act, allegedly not standing up to Russia and accusations of not responding to constituents over the confirmation process of Education Secretary Betsy DeVos.

The ad is part of the group's ongoing effort in Nevada and is part of an initial 5-figure digital advertising campaign, which will likely increase as the election draws closer.