(CNN) - The National Republican Senatorial Committee said it took disciplinary action after a staffer tweeted a link about Alison Lundergan Grimes that her campaign called sexist.
The link directed readers to a blog post titled "Grimes Is The New 'Obama Girl'?" on the website, BluegrassBulletin.com.
The post originally included a photoshopped image of Grimes' head on the body of Amber Lee Ettinger, better known as the "Obama Girl" who became famous in 2008 for her racy videos endorsing President Obama's first presidential campaign.
Grimes, a Democrat and Kentucky's Secretary of State, is challenging Senate Minority Leader Mitch McConnell for his Senate seat in next year's elections.
The author of the blog post notes the image has been removed.
"It was intended to be a humorous punctuation mark to (Alison Lundergan Grimes) being an intended beneficiary of Michele Obama's fundraising at a Washington DSCC event," the author writes.
After the NRSC tweeted a link to the post, Grimes' campaign called the tweet a "tasteless and sexualized attack" in a press release.
"The NRSC should stand for Notoriously Repeating Sexist Comments – they cannot relate or connect with the women of Kentucky or our country," Grimes said in a statement. "As I have said, I am proud to wear a dress, and as Kentucky's more than two million women know, it is not what is in the dress that matters."
NRSC Press Secretary Brook Hougesen said the group agrees that the tweet was "extremely offensive."
"It was a mistake made by a junior staffer and disciplinary action has been taken. We took corrective action as soon as it was brought to our attention and have taken steps to ensure it will never happen again," she said in a statement.