Sen. Mary LandrieuMary Loretta LandrieuLandrieu dynasty faces a pause in Louisiana Senate GOP rejects Trump’s call to go big on gun legislation Project Veritas at risk of losing fundraising license in New York, AG warns MORE (D-La.) is calling for Rep. Bill Cassidy (D-La.), her establishment-backed opponent in the Louisiana Senate race, to apologize for a tweet his campaign manager sent linking to a blog that featured a controversial photo.

The photo superimposes Landrieu's face on Italian dictator Benito Mussolini's body.

"Louisiana politics is colorful and spicy, but this picture is downright despicable and disrespectful," said Landrieu's campaign manager, Adam Sullivan.

"Simply tweeting the image was bad enough, but refusing to take it down now is even worse. The Cassidy campaign owes an apology to Sen. Landrieu and should immediately take down this hurtful reminder of one of the worst and most horrific events in world history."

The picture, titled "Mussolandrieu," appeared on local Louisiana political blog The Hayride attached to a post about Landrieu's vote with a majority of her party on Thursday to change the rules of the Senate to effectively eliminate filibusters against most presidential nominations.

"She’s an embarrassment to the state, a rank hypocrite of the first order, a shameless party hack in the service of the worst majority leader the Senate has ever had and a cancer on our body politic which cannot be removed quickly enough," writes the author of the blog.

"Whatever it takes to get rid of Mary Landrieu must be done. She proved that today."

Cassidy's campaign manager, Joel DiGrado, tweeted a link to the  piece on Thursday, and has not yet taken the tweet down.

DiGrado did not respond to a request for comment.

His tweet comes two days after a National Republican Senatorial Committee staffer tweeted out a photo of Kentucky Democratic candidate Alison Lundergan Grimes's face superimposed on the body of the "Obama Girl," a model who gained fame after making a series of racy videos about her "crush" on then-Sen. Barack Obama in 2008.

The NRSC apologized for and deleted that tweet and said it had disciplined the staffer that sent it.