SOMERSWORTH, N.H.SOMERSWORTH, N.H. (Reuters) - Former U.S. Vice President Joe Biden vowed on Wednesday to go on fighting for the Democratic presidential nomination despite what he called the "gut punch" he took in Iowa, where he lagged in fourth place.

With 97% of precincts reporting from Monday's caucuses, Biden was behind former South Bend, Indiana Mayor Pete Buttigieg and U.S. Senators Bernie Sanders and Elizabeth Warren in the first nominating contest of the 2020 campaign.

"I am not going to sugarcoat it: We took a gut punch in Iowa. The whole process was a gut punch,” Biden said in Somersworth, New Hampshire, where he was campaigning. “This isn’t the first time in my life that I’ve been knocked down.”

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Biden, who bills himself as the most electable Democratic candidate to take on Republican President Donald Trump in the Nov. 3 election, led many national polls in the run-up to Iowa and has a host of high-profile endorsements.

But his campaign is in trouble.

"There are an awful lot of folks out there who wrote off this campaign. ... They’ve been trying to do that from the moment I entered the race. Well, I’ve got news for them. I’m not going anywhere," Biden said.

In an unusually direct address, Biden took aim at Sanders and Buttigieg as he tried to recover ahead of the New Hampshire state primary next Tuesday.

Biden, 77, said every Democrat running for the House of Representatives or Senate this year would have to carry the label "socialist" if Sanders became the Democratic nominee. An independent, Sanders calls himself a democratic socialist.

BUTTIGIEG AHEAD

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Buttigieg, 38, held a very narrow lead over Sanders, 78, in the Iowa caucuses, according to partial results released on Wednesday. Problems with an app used for vote counting had delayed a final count. Warren, 70, placed third.

Buttigieg, who would be the first openly gay U.S. president if elected, had 26.2% of state delegate equivalents, the data traditionally reported to determine the winner. Sanders was closing in with 26.1%, Warren was at 18.2%, and Biden garnered 15.8%.

Sanders was slightly ahead of Buttigieg in the Iowa popular vote, which is not used to determine the delegates who will formally choose the nominee at the Democratic National Convention in July.

After more than a year of campaigning and spending more than $800 million, the results in Iowa had been expected to provide some answers for Democrats desperately trying to figure out how to beat the businessman-turned-president.

But the delay has blunted the momentum of the state's eventual winner. The partial results have been released in batches on Tuesday and Wednesday and the Iowa Democratic Party has not said when it will announce the rest.

Buttigieg has argued it is time for a new generation of leaders and that his lack of experience in Washington makes him an ideal candidate to break the partisan gridlock there.

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FILE PHOTO: Democratic presidential candidate and former Vice President Joe Biden speaks at a campaign event in Nashua, New Hampshire, U.S., February 4, 2020. Reuters/Rick Wilking FILE PHOTO: Pete Buttigieg, Democratic presidential candidate and former South Bend, Indiana mayor speaks during s campaign event in Laconia, New Hampshire, U.S., February 4, 2020. Reuters/Brendan McDermid Democratic U.S. presidential candidate Senator Bernie Sanders speaks to voters at a town hall campaign event in Derry, New Hampshire, U.S., February 5, 2020. Reuters/Mike Segar Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) speaks at a GOTV campaign event in Nashua, New Hampshire, U.S., February 5, 2020. Reuters/Brian Snyder

But he might struggle to win in New Hampshire, where Sanders, who represents neighboring Vermont, leads in many opinion polls, and in the next Democratic primary in South Carolina on Feb. 29 where Biden expects to receive strong backing from the African-American vote.

Biden accused Buttigieg of being insufficiently supportive of the achievements of the Obama administration and cast doubt on his experience.

“It’s a risk - to be just straight up with you - for this party to nominate someone who’s never held an office higher than mayor of a town of 100,000 people in Indiana,” said Biden, who was President Barack Obama's vice president for eight years.

Jeannie Collins, 34, who works in human resources in Manchester, New Hampshire, said she was leaning toward voting for Sanders but agreed with Biden’s concern that the senator may be too left wing for many Americans.

That concern was more likely to make her vote for Buttigieg rather than Biden, she said.

“I just feel like it's time for the younger generation. That's why I really like Buttigieg,” she said. She described Sanders as “older but his views are younger”.

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Two other Biden opponents - Warren and billionaire former New York Mayor Michael Bloomberg - released ads on Wednesday highlighting their ties to Obama in a move to pick up Biden supporters who may be reconsidering after his poor performance in Iowa.

Warren’s advertisement about her creation of the Consumer Financial Protection Bureau during Obama’s administration uses narration from the former president praising Warren as being “very tough” and “one of the country’s fiercest advocates for the middle class”.

Bloomberg’s ad quotes Obama praising the former mayor’s work on gun control and education, saying he has shown “what can be achieved when we bring people together to seek pragmatic solutions”.