The former popstar and his girlfriend Gabby Allen were heavily tipped to win Love Island after boasting millions of fans, including the Labour leader.
Jeremy Corbyn urged viewers to back Marcel, which the 31-year-old has teased could have been his downfall.
“I’d advise that Marcel needs a vote…We should give him a vote. He needs a bit of, shall I say, TLC,” he told the legion of Love Island fans.
However, after Corbyn’s backing, Marcel and Gabby fell out of favour and lost out on the show’s £50,000 prize fund.
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Jeremy Corbyn to blame for Love Island star's loss?
Jeremy Corbyn at Glastonbury
Mon, June 26, 2017
Labour leader Jeremy Corbyn spoke to vast crowds from the Pyramid stage and the Left Field stage at the 2017 Glastonbury Festival
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Labour leader Jeremy Corbyn in the Greenpeace area at Glastonbury Festival
There are obviously people there who don’t really like him
Love Island star Marcel Somerville
“There are obviously people there who don’t really like him,” Marcel admitted, exclusively to Express.co.uk. “But at the same time, he’s Jeremy Corbyn!
“I don’t know, we finished fourth – I’m joking! It’s big to be supporting you.”
Gabby added: “It’s mad that these people know who we are, that’s weird isn’t it?”
Marcel Somerville received Jeremy Corbyn's backing on Love Island
Marcel and Gabby Allen lost out in the Love Island final
Elsewhere, the Love Island stars fought back at Piers Morgan, after he continually disregarded the reality TV contestants as “the most stupid collection of people”.
Good Morning Britain airs weekdays at 6am on ITV, while Love Island is expected to return to ITV2 next year.