It was meant to be a simple campaign stop.

Hillary Clinton went into a coffee shop in Detroit ahead of the Michigan primary, hoping to drum up some support before posting a picture of her visit on Instagram.

But her plan quickly backfired when she tagged the wrong cafe - and now the barista who served the Democratic front runner has demanded she take the photo down because she is a Bernie Sanders voter.

Hillary Clinton posted a photograph of her visit to Astro Coffee in Detroit, Michigan, but the barista pictured demanded she take it down because is a Bernie Sanders voter

The server, Jill Wilson (pictured), posted a reply to the picture, saying: 'That's me and I'm voting Bernie. I'd like it if you took the pic down.

Clinton originally tagged Avalon Bakery - another establishment she visited that day - but later corrected it

Clinton stopped by Astro Coffee in Detroit on Tuesday while voting was underway in Michigan.

She got chatting with customers and staff before having one of her aides take a picture of her ordering an espresso.

The Democratic presidential hopeful walked out of the coffee shop with a smile on her face, but she left the barista who served her with a sour taste in her mouth when she posted a photo of their encounter on Instagram.

The server, Jill Wilson, posted a reply to the picture, saying: 'That's me and I'm voting Bernie. I'd like it if you took the pic down.'

Ms Wilson has since deleted her Instagram and Twitter pages.

Clinton made matters worse for herself by tagging Astro Coffee as a different establishment she had visited earlier in the day.

Her original post read: 'Inspired by the women who started @AvalonBakery. Highly recommend the coffee, too.'

Astro Coffee later made a dig at Clinton, posting a picture of her chatting with people inside the cafe with the caption: 'Espresso to go?!? She must be feeling the BERN'

Clinton was also pictured visiting Avalon International Breads - the bakery she wrongly tagged in the original Instagram post

Avalon International Breads is about two miles away from Astro Coffee. The bakery posted a video on their Instagram of Clinton visiting on Tuesday.

Clinton changed the caption on the picture to recommend visiting Astro Coffee, but did not remove the image.

Dozens of people have called for the former Secretary of State to take down the photo of her and the barista.

On Instagram user wrote: 'I'm not here harassing anyone & not advocating harassment, HRC should have taken this down hours ago. The fact that she literally cannot respect this one person shows me that she isn't capable of respecting anyone else, much less an entire country of voters.'

Jordan White wrote: 'Instead of untagging the bakery on here and changing the caption, maybe take down the picture like the person [in] the picture requested.'

'She can delete emails but not the picture,' another Instagram user said.

Astro Coffee later made a dig at Clinton, posting a picture of her chatting with people inside the cafe.

The caption read: 'Espresso to go?!? She must be feeling the BERN.'

Clinton went on to narrowly lose to Sanders in Michigan, with Bernie taking 18,427 more votes - and six more delegates - than his Democratic rival.

The Republican primary in Michigan was won by Donald Trump, who beat off competition from Ted Cruz and John Kasich, with Marco Rubio in a distant fourth.