US media tycoon Michael Bloomberg has qualified for Wednesday's Democratic presidential debate, after a new poll shows him leapfrogging several of his rivals, including Joe Biden, to claim second spot in the race for the party nomination.
Mr Bloomberg's surge meant that he cleared a polling threshold set by the Democratic National Committee, placing the former New York mayor on stage to spar with fellow candidates, several of whom have launched broadsides against him, for the first time.
The billionaire businessman who only jumped into the race in November, nearly a year after many of his rivals, earned 19 per cent support nationally, second to leftist Bernie Sanders at 31 per cent, in an NPR/PBS NewsHour/Marist survey.
The moderate former vice president Joe Biden came in third at 15 per cent in the poll of some 1,400 registered voters, while progressive Senator Elizabeth Warren was at 12 per cent and pragmatist Senator Amy Klobuchar at nine per cent.
"Mike is looking forward to joining the other Democratic candidates on stage and making the case for why he's the best candidate to defeat Donald Trump and unite the country," the Bloomberg campaign said Tuesday in a statement.
"The opportunity to discuss his workable and achievable plans for the challenges facing this country is an important part of the campaign process."
Mr Bloomberg, seen as a centrist, has been rising in the polls as he spends hundreds of millions of dollars of his vast personal fortune to blanket the airwaves with campaign ads.
Democratic presidential candidate Michael Bloomberg speaks at a campaign event on Thursday, Feb. 13, 2020, in Houston, Texas. Source: AAP
In the RealClearPolitics national poll average he has climbed into third spot, behind Mr Sanders, also 78, and Mr Biden, who is 77.
More evidence of his momentum: he is coming under frequent attack from rivals - including Mr Sanders, Mr Biden and Pete Buttigieg - and from Mr Trump himself.
Mr Sanders has repeatedly slammed Mr Bloomberg for his attempt to "buy" his way into the presidential race, and by highlighting Mr Bloomberg's absence on the campaign trail in early-voting states.
Others have aimed sharp criticism at Mr Bloomberg's past positions and comments that have been criticised as crude, racist or misogynistic.
Wednesday's debate will be held in Las Vegas, three days ahead of Nevada's caucuses.
Mr Bloomberg is skipping the first four state contests to concentrate on so-called Super Tuesday on March 3, when 14 states vote on choosing a Democratic nominee.
They include the most populous states California, where Mr Bloomberg is polling fifth, and Texas, where he polls fourth.
Mr Bloomberg was a Democrat until he left the party in 2001.
He served three terms as New York's mayor, first as a Republican, then as an independent. He re-registered as a Democrat in 2018.
