Actor Scott Baio told Fox News host Jeanine Pirro that he's joined the Trump train because he likes Donald Trump's message and toughness. "It's very simple, because when he speaks I understand him," Baio explained. "He speaks like I speak. He communicates with people very well."AFP/Getty Images
Phil Robertson, best known for his role on the A&E reality television show "Duck Dynasty," has endorsed Texas Sen. Ted Cruz for the Republican nomination.
Comedian Tommy Chong loves Bernie Sanders and has endorsed the Vermont senator for president.
"Bernie's like a kush, like the best kind of weed you can get, because he's the answer to all our problems," Chong told CNN.
Around 200 people crowded into a New Hampshire restaurant in January to see retired soccer star Abby Wambach (arms outstretched) and actress Lena Dunham (wearing the hat). Both endorsed Hillary Clinton.
"I'm embarrassed to say this, but it took me far too long to start voting," Dunham told the crowd. "I had been of legal age for more than four years before I cast my first vote in the 2008 presidential election. It's not that I didn't care, but I didn't believe that me caring mattered. It was impossible for me to comprehend that one young woman checking a box after waiting in a long line could matter on a national level."Scott Eisen/Getty Images
Clinton turned to a new celebrity surrogate -- singer Demi Lovato -- in an effort to win over young women in Iowa, a state where Sanders' strength depends largely on his ability to turn out the youth vote.
In January, Clinton and Lovato drew a crowd of largely young women to the University of Iowa campus, where Lovato vouched for Clinton. After performing her hit song "Confident," Lovato said: "I don't think there's a woman more confident than Hillary Clinton."Jae C. Hong/AP
UFC champion Ronda Rousey endorsed Sanders for president.
"I'm voting for Bernie Sanders, because he doesn't take any corporate money," Rousey told Maxim magazine. "I don't think politicians should be allowed to take money for their campaigns from outside interests."AFP/Getty Images
Actress Eva Longoria has been an outspoken Clinton supporter since Clinton's 2008 campaign.
She told TMZ in 2013 that if Clinton ran for President, she'd "absolutely" support her.ROBYN BECK/AFP/AFP/Getty Images
Katy Perry, wearing Clinton's famous H logo on her white dress, rallies Clinton supporters outside a dinner in Des Moines, Iowa, in October.
"Family Guy" creator Seth MacFarlane is a Sanders supporter. He introduced the Vermont senator at a rally in October, telling the crowd, "He's the only candidate on either side who truly seems to grasp the magnitude of the catastrophe (of climate change)."AFP/Getty Images
Basketball superstar Kareem Abdul-Jabbar wrote an op-ed in The Washington Post slamming GOP candidate Donald Trump and praising Sanders for how they've handled their campaigns.
He wrote that Sanders is "a mature, thoughtful and intelligent man."AFP/Getty Images
In an interview with The New York Times magazine, musician Kid Rock said that he was "very interested" in the things Republican presidential candidate Ben Carson has to say.AFP/Getty Images
Actor Chuck Norris has a very public bromance with former GOP candidate Mike Huckabee. When Huckabee announced his candidacy, Norris told The New York Times in a statement, "I still believe Mike Huckabee is the most qualified."
Norris also endorsed Huckabee when he ran for President in 2008.SAUL LOEB/AFP/AFP/Getty Images
Actor James Woods took to Twitter to say how much he admired Republican presidential candidate Carly Fiorina, saying he was "proud to support this remarkable woman and her historic campaign." Fiorina suspended her candidacy in February. AFP/Getty Images
Television personality Kim Kardashian endorsed Clinton in a Facebook post shortly after the first GOP debate wrapped in August.
She took a selfie with Clinton, writing, "I got my selfie!!! I really loved hearing her speak & hearing her goals for our country! #HillaryForPresident."
"Pawn Stars" star Rick Harrison told CNN's Chris Moody that he endorsed Republican presidential candidate Marco Rubio, but the decision could cost him. He said he was "deeply impressed" with Rubio when he first met him, but that as a celebrity, getting political does worry him "to a degree."AFP/Getty Images
Rapper 50 Cent announced his support for Clinton, telling The Daily Beast, "It's Hillary time!"AFP/Getty Images