Hillary Clinton was in Hollywood this week, trying to drum up support — and money — for her cash-strapped campaign.

She stopped by the set of “Scandal” for a photo-op with actress Kerry Washington, and she had at least two fundraisers lined up, one of them thrown by Jon Vein, chief strategy officer and co-founder of MarketShare, and his movie-producer wife Ellen Goldsmith-Vein.

You’d think raising funds would be a slam dunk: Liberal Tinseltown has always loved anything Clinton. But Hillary ’16 has been struggling in Hollywood.

Her events in Los Angeles and San Francisco are having trouble selling tickets, according to the Los Angeles Times. Just weeks ago, The Hollywood Reporter’s Women in Entertainment Power 100 list revealed scant support for the woman who wants to be president, with only one in four powerful women on the list having contributed to Clinton’s campaign. One unnamed female executive was quoted as saying Clinton “hasn’t been doing a very good job reaching out to power women.”

The erosion started last summer when it looked like Vice President Joe Biden might run. The Wrap said Hollywood supporters began turning away from Clinton, ready to back Biden. Prominent Democratic fundraiser Howie Mandel (not the TV star) said that high-profile donors in the entertainment industry didn’t “want to see” a Clinton “coronation.”

Add to that the fact that earlier this month, big money music mogul David Geffen — who said in 2014 he would be supporting a Clinton 2016 ticket – is suddenly saying he is “not supporting anybody.”

And Tim Allen’s face said it all in an interview with Fox News anchor Megyn Kelly last week.

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Even pop star Katy Perry’s loyalty to Clinton was called into question on Friday when The Washington Free Beacon reported that the singer/musician, who has been an ardent and visible HRC supporter, was actually paid for her endorsement.

What happened was that Perry endorsed Clinton in October. Two months later, the Hillary for America campaign reported paying Perry’s company, Kitty Purry Inc., about $70,000 for “event production.” It was unclear what those services were. On Monday, Clinton campaign spokesman Josh Schwerin told Variety the money was to cover “basic production” costs.

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But how about that moment last week with another pop star? Britney Spears posed with Clinton in Las Vegas and posted a photo on Instagram that ended with the campaign phrase: #Imwithher. But later the hashtag endorsement had been removed, according to the Daily Mail, which ran a screengrab of it. It seems maybe Spears didn’t want to align herself that closely with the candidate.

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On the other side of the fence, Donnie Wahlberg was so proud of his recent decision to back Marco Rubio that he sent out a press release about it on Sunday. “Even though we do not see eye to eye on every issue, I know that Marco is a man of principle who can be trusted to keep us safe and give each and every one of us a shot at the American Dream,” Wahlberg said in a statement. Rubio welcomed him with open arms.

But celebrity endorsements can backfire. Researchers at Bowling Green State University conducted a poll of Ohio general election voters to find out if star power actually helps a campaign. The answer is no.

George Clooney, Oprah Winfrey, Eva Longoria and Trace Adkins were all seen as a net negative for any candidate. The biggest lightning rod for negativity? Beyonce. She would cost a candidate nearly 20 percent of voters.

Meanwhile, Bernie Sanders has an entire website page devoted to Artists for Bernie with a slew of stars showing their support. Among the names on the list: Jeremy Piven, Mark Ruffalo, Jackson Browne and Danny DeVito.

The Sanders campaign has been featuring some celebrities on the campaign trail, including “Hunger Games” star Josh Hutcherson and the band Vampire Weekend, while proudly drawing a list of Hollywood backers that includes Neil Young, Seth MacFarlane, Sarah Silverman and Ronda Rousey. Spike Lee is the latest to endorse Sanders, in a radio spot that said the candidate will “do the right thing.”

Sports Illustrated swimsuit cover girl and MMA fighter Rousey explained her support in an interview with Maxim saying, “I’m voting for Bernie Sanders because he doesn’t take any corporate money. I don’t think politicians should be allowed to take money for their campaigns from outside interests.”

And let’s not forget Susan Sarandon, who campaigned with Sanders in Iowa. The actress put it this way when she tweeted her reasons for not backing Hillary: “I don’t vote with my vagina. It’s so insulting to women to think that you would follow a candidate JUST because she’s a woman. HRC doesn’t rep my interests, @BernieSanders does. Simple as that.”

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Bill Maher painted an even more pathetic picture of Clinton, describing her as “Charlie Brown” in an essay for The Hollywood Reporter. He noted that “the hatred for her is just amazing — the hatred on the right and the abandonment on the left.”