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Michael Moore is warning Democrats that they'd better take Donald Trump seriously because of his appeal to working-class voters in places like West Virginia.

"I think everybody now is taking Donald Trump very seriously," the liberal filmmaker and author said on The Kelly File. "And everybody who thought he was a joke last summer, 'no way is this going to happen'...nobody should treat it like it's a joke now."

Moore said Trump is at a disadvantage when it comes to the raw numbers, but he said Republican voters tend to be more mobilized.

"What he has on his side -- and this is one thing I admire about Republicans -- they get up in the morning and vote. They will be at the polls at 6 a.m. My side, we only see 6 a.m. if we've been partying all night."

Watch the discussion above.

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