Sen. Minority Leader Mitch McConnell's (R-Ky.) unpopularity in his home state might leave him susceptible to a 2014 challenge, including a potential Senate bid by actress Ashley Judd, according to a poll released Tuesday by the Democratic firm Public Policy Polling.

Although Kentucky remains deeply Republican, McConnell's low approval ratings -- the worst of any senator nationally, according to PPP -- could make him vulnerable. Just 37 percent of Kentucky voters approve of his performance, while 55 percent disapprove.

McConnell, who eked out a slim victory in 2008, has already begun preparing to fight for reelection. He hired former Ron Paul strategist Jesse Benton to run a "presidential-level campaign in Kentucky," McConnell said in a statement in September.

While some speculated the move was meant to ward off potential Tea Party rivals, PPP found that half of GOP voters would like to see McConnell as their party's nominee, while just 35 percent would favor someone more conservative.

Benton has predicted a challenge from the left, instead. "We're not anticipating a primary challenge," he told Business Insider in September. "But we expect him to be the biggest target for the national Democrats."

One challenger he might not have expected is Judd, who is reported to be seriously considering a Democratic bid. PPP found that Judd would be the top choice of Democratic primary voters, and would trail McConnell by just four points in a hypothetical matchup, 43 percent to his 47 percent.

McConnell led the state's lieutenant governor, Jerry Abramson, and its attorney general, Jack Conway, by equal margins. He fared better against other prospective candidates, with his widest lead a 12-point margin over state auditor Adam Edelman.

"Even though a lot of Republicans dislike him, most of them would still vote for him in a general election before they would support a Democrat," PPP's director, Tom Jensen, wrote in his analysis of the poll's results. "This is the same phenomenon we saw in Florida and Pennsylvania this year where Bill Nelson and Bob Casey won by solid margins despite middling approval numbers because Democrats that weren't thrilled with them still voted for them. And although independents don't like McConnell they don't like most of the Democrats either, and they support McConnell in every match up we tested."

McConnell's campaign dismissed the poll's methodology on Twitter, saying automated surveys like those conducted by PPP can overestimate disapproval rates. They linked to a September poll showing him with a 51 percent approval rating.

The PPP poll surveyed 1,266 Kentucky voters between Dec. 7 and Dec. 9, using automated phone calls. The margin of error was 2.8 percent.

Also on HuffPost:

Loading Slideshow...
  • George Clooney & President Obama

    Actor George Clooney leaves after he spoke to the media March 15, 2012 at the White House in Washington, DC. Clooney had meeting with President Barack Obama to discuss the current situations in Darfur, Sudan. (Photo by Alex Wong/Getty Images)

  • President Obama & Tyler Perry

    Actor and director Tyler Perry hugs US President Barack Obama during a campaign event at Tyler Perry Studios March 16, 2012 in Atlanta, Georgia. President Obama is spending the day traveling to Chicago, Illinois and Atlanta, Georgia to attend private and public campaign events. (Photo by BRENDAN SMIALOWSKI/AFP/Getty Images)

  • The Obamas & Oprah Winfrey

    US President Barack Obama and First Lady Michelle Obama chat with talk show host Oprah Winfrey during a taping of the Oprah Winfrey show April 27, 2011 at Harpo Studios in Chicago. (Photo by MANDEL NGAN/AFP/Getty Images)

  • President Obama & Magic Johnson

    In this handout image provided by the U.S. Navy, President Barack Obama is greeted on the court by NBA Hall of Fame basketball player Earvin 'Magic' Johnson and Michigan State University assistant coach Mike Garland. (Photo by Mass Communication Specialist 2nd Class James R. Evans/U.S. Navy via Getty Images)

  • Willow Smith Performs At The White House

    Willow Smith, daughter of Will Smith and Jada Pinkett Smitt, performs during the White House Easter Egg Roll on the South Lawn of the White House on April 25, 2011 in Washington, DC. (Photo by Roger L. Wollenberg-Pool/Getty Images)

  • Antonio Banderas & President Obama

    Antonio Banderas and his wife Melanie Griffith hosted a fundraising event for President Obama in October 2011. (Photo by Sean Gallup/Getty Images)

  • Tom Hanks Narrates Pro-Obama Film

    This 17-minute film released by President Obama's re-election campaign was directed by Davis Guggenheim (director of "An Inconvenient Truth") and narrated by actor Tom Hanks.

  • Gov. Mitt Romney & Jeff Foxworthy

    Republican presidential candidate, former Massachusetts Gov. Mitt Romney makes a campaign appearance with comedian Jeff Foxworthy at the Whistle Stop cafe March 12, 2012 in Mobile, Alabama. (Photo by Win McNamee/Getty Images)

  • Gov. Mitt Romney & Kid Rock

    Republican presidential candidate and former Massachusetts Gov. Mitt Romney greets musician Kid Rock during a campaign rally at the Royal Oak Theatre on February 27, 2012 in Royal Oak, Michigan. (Photo by Justin Sullivan/Getty Images)

  • David Mustaine & Rick Santorum

    David Mustaine of Megadeth expressed support for Rick Santorum in a February <a href="http://www.musicradar.com/news/live/interview-megadeths-dave-mustaine-talks-guitar-politics-and-todays-music-529703" target="_hplink">interview with Music Radar</a>.

  • Kelly Clarkson & Ron Paul

    Kelly Clarkson tweeted about her love for Ron Paul in late 2011, but dialed it back slightly after a backlash accused her of supporting Paul's racist and homophobic publications, <a href="http://www.foxnews.com/entertainment/2012/03/09/kelly-clarkson-never-endorsed-ron-paul/" target="_hplink">reports Fox News</a>. (Photo by ROBYN BECK/AFP/Getty Images)

  • Snoop Dogg & Ron Paul

    In December 2011, Snoop Dogg posted a picture of Ron Paul on his Facebook page with the caption "Smoke Weed Every Day," <a href="http://www.reuters.com/article/2012/01/31/us-snoopdogg-ronpaul-idUSTRE80U04220120131" target="_hplink">reports Reuters</a>. (Photo by Ethan Miller/Getty Images for Keep Memory Alive)

  • Oliver Stone & Ron Paul

    In January, Oliver Stone told <a href="http://www.rockcellarmagazine.com/2012/01/12/director-oliver-stone-on-history-and-america-jim-morrison-ron-paul/" target="_hplink">Rock Cellar Magazine</a> that he would vote for Ron Paul over Barack Obama if Paul was named the GOP nominee because "he's the only one of anybody who's saying anything intelligent about the future of the world." (Photo by Stephen Morton/Getty Images)