Donald Trump -- Huffington Post Refuses to Acknowledge Candidacy

Donald Trump is being boycotted again, but this one's bizarre ... Huffington Post is refusing to treat him as a serious Presidential candidate.

Here's what HuffPo says, "After watching and listening to Donald Trump since he announced his candidacy for president, we have decided we won't report on Trump's campaign as part of The Huffington Post's political coverage. Instead, we will cover his campaign as part of our Entertainment section."

Weird stance for a media outlet to take, considering recent polls show Trump leading ALL Republican candidates ... winning 18% of GOP voters.

HuffPo calls Trump's campaign a "sideshow," adding, "We won't take the bait." The website will cover Trump in its entertainment section, saying, "you'll find it next to our stories on the Kardashians and The Bachelorette."

Trump just responded, noting he's been the leading candidate in numerous polls and adding, "The only clown show in this scenario is the Huffington Post pretending to be a legitimate news source."