Elizabeth Warren’s campaign addressed apparent flaws among her fellow Democratic presidential hopefuls leading the pack in the 2020 primaries in a new memo obtained by multiple outlets ahead of a crucial vote in New Hampshire.

The memo, written by the Massachusetts senator’s campaign manager, Roger Lau, reportedly described a “ceiling” of support for Bernie Sanders, another progressive candidate who has polled at the top of the crowded field ahead of the state’s first-in-the-nation primary.

It also predicted Joe Biden’s campaign could soon collapse following the former vice president’s weak showing in Iowa, according to the Associated Press.

The campaign memo also foreshadowed darker days ahead for Pete Buttigieg, who claimed victory in the Iowa caucus on the night of the event, despite significant delays in the official results due to complications with an app used to transmit vote counts from precincts across the state.

The memo said Mr Buttigieg, who appeared to have virtually tied with Mr Sanders in Iowa, would face challenges building a strong enough coalition in more diverse states throughout the primary process.

Democratic candidates compete on the campaign trail: In pictures Show all 18 1 /18 Democratic candidates compete on the campaign trail: In pictures Democratic candidates compete on the campaign trail: In pictures Jessica Canicosa, a precinct captain for Bernie Sanders, waits to greet caucus voters at Liberty High School in Henderson, Nevada REUTERS Democratic candidates compete on the campaign trail: In pictures Hotel workers at the Bellagio in Las Vegas get to grips with voting papers during the Nevada caucuses AFP via Getty Images Democratic candidates compete on the campaign trail: In pictures A caricature of Bernie Sanders is projected on to a tree during a rally in Las Vegas EPA Democratic candidates compete on the campaign trail: In pictures A woman waits to have a photo taken with Elizabeth Warren during a town hall meeting in Las Vegas REUTERS Democratic candidates compete on the campaign trail: In pictures The threat of coronavirus and other germ-borne illnesses was on some voters' minds at the Democratic caucuses in Henderson, Nevada Getty Images Democratic candidates compete on the campaign trail: In pictures Former vice-president Joe Biden takes a selfie with a voter in Las Vegas ahead of the Nevada caucuses REUTERS Democratic candidates compete on the campaign trail: In pictures Amy Klobuchar changes her shoes backstage after giving a speech in Exeter, New Hampshire AFP/Getty Democratic candidates compete on the campaign trail: In pictures A warmly-wrapped-up dog attends an Elizabeth Warren event at Amherst Elementary School in Nashua, New Hampshire AFP/Getty Democratic candidates compete on the campaign trail: In pictures Bernie Sanders, who romped to victory in New Hampshire against Hillary Clinton in 2016, talks to the media in Manchester Getty Democratic candidates compete on the campaign trail: In pictures Joe Biden was hoping to improve on his poor showing in Iowa in the New Hampshire primary Reuters Democratic candidates compete on the campaign trail: In pictures Elizabeth Warren, renowned for giving time to supporters for selfies, works the crowd at the University of New Hampshire in Durham Getty Democratic candidates compete on the campaign trail: In pictures Joe Biden takes a selfie with a supporter and his child outside a campaign event in Somersworth, New Hampshire on 5 February Reuters Democratic candidates compete on the campaign trail: In pictures Elizabeth Warren and Bernie Sanders quarrel after a confrontation in a TV debate in which Sanders claimed that Warren was not telling the truth about a conversation in which she claimed he had said a woman could not win the presidency on 14 January AP Democratic candidates compete on the campaign trail: In pictures Supporter Pat Provencher listens to Pete Buttigieg in Laconia, New Hampshire on 4 February Getty Democratic candidates compete on the campaign trail: In pictures Pete Buttigieg speaks at a campaign event in Concord, New Hampshire while awaiting the results of the Iowa caucus Reuters Democratic candidates compete on the campaign trail: In pictures Elizabeth Warren is presented with a balloon effigy of herself at a campaign event in Nashua, New Hampshire on 5 February Reuters Democratic candidates compete on the campaign trail: In pictures A Trump supporter rides past a rally for Amy Klobuchar in Des Moines, Iowa on 14 January AP Democratic candidates compete on the campaign trail: In pictures A man holds up a sign criticising billionaires in the presidential race in front of Michael Bloomberg in Compton, Califronia. The former New York mayor skipped the first caucus in Iowa and instead campaigned in California on 3 February Reuters

In writing the memo, Mr Lau was seemingly attempting to reassure the progressive candidate’s voters that she would maintain a shot in the Democratic primaries after the vote in New Hampshire, where Mr Sanders was expected to win as he did in the state during the 2016 primaries.

Both Ms Warren and Mr Sanders’ home states border New Hampshire, which is seen as one of the states that successfully predicts which candidates become the party’s eventual nominee.

Ms Warren has largely avoided comparing herself to Mr Sanders and the other Democratic candidates, focusing instead on releasing a series of sweeping plans meant to deliver bold, structural changes to the US.

In recent months, however, the candidate has attacked Mr Buttigieg over receiving funding from corporate donors and wealthy billionaires, while touting her campaign’s grassroots organisational efforts.

Mr Lau also cited the campaign’s organisation on a national level in the memo obtained on Tuesday, saying Ms Warren has staffers across nearly 30 states.