Kennedy heir Jack Schlossberg has failed to catch fire with voters as he runs for the Democrat nomination in a deep blue congressional seat.

But you wouldn't know that if you just went to his own apartment in the Chelsea district of New York.

'Jack Schlossberg for Congress' appear all over the building even though the management company immediately tears them down – but go a few blocks and there are none to be seen.

'It's almost as if he is putting them up himself but can't be bothered to go out into the district,' one critic said.

Another said it seems that Schlossberg's campaign is taking the words of former House Speaker Tip O'Neill – All Politics is Local – literally. 

Others suggest it is merely a morale-boosting scheme from members of his campaign staff to keep him interested in the race which will be decided on Tuesday.

New 'Jack Schlossberg for Congress' signs have become a near-daily fixture outside the 33-year-old political scion's digs have routinely been taken down by building management – only to suddenly reappear just hours later, the sources said. 

'The posters outside the building have become a running joke inside the building,' one source said. 

'They disappear, they come back, they disappear again, and somehow they're back the next morning.'

'The posters are literally outside his front door,' another insider chimed in. 'The building takes them down and then they're back again the next day.'

President John F Kennedy's only grandson is vying for New York's deeply Democrat 12th congressional district which covers Manhattan's Upper East Side, Upper West Side and midtown. 

But primary voters appear to be giving him the cold shoulder, polling suggests. 

In the lead-up to Tuesday's primary, Schlossberg's polling slumped considerably – with the campaign shifting into morale-boosting mode in its final days.

'It's funny because his block is covered in posters,' a source said. 'You'd think there was a huge grassroots movement. Then you walk a few streets away and you don’t see any.'

'The mood is pretty bleak," another alleged. 'People around him know the race is an uphill battle, so the focus has become keeping him positive and motivated.'

A recent AARP New York/Siena Poll had Schlossberg trailing with just 9 percent support compared to frontrunner Micah Lasher (32 percent) and Alex Bores (21 percent). They are bidding to replace veteran Democrat Representative Jerry Nadler, 79, who is retiring after 17 terms in the House.

An Emerson College survey from last month had Schlossberg polling slightly better with 11 percent of votes. 

Lasher, a New York state representative, was leading that poll with 22 percent of support.  

In addition to the grim polling figures, Schlossberg was said to also be particularly stung by negative media reports ripping him for a lazily-run campaign. 

Multiple insiders told the New York Times that Schlossberg's quest for the congressional seat had largely been bogged down by bizarre behavior, absences and a high turnover in staff. 

Just hours after launching his campaign last November, the Kennedy heir apparently canceled events so he could take a nap, sources alleged. 

The insiders added, too, that the incident was emblematic of Schlossberg's immature behavior on the campaign trail. 

Schlossberg quickly fired back, insisting the Times article was full of lies. 

'There's a lot in that article that's not true. I'm a decisive person and I run an operation that's nimble and small,' he told CNN. 

'I work harder than anybody I know, we're doing it all and making it look easy.' 

Separately, Schlossberg's critics have also taken to bashing his lack of political experience - despite being a scion of one of America's most powerful political families. 

They argued, in part, that Schlossberg had done little in his career to warrant a congressional seat.

Before deciding to take a run at elective politics, Schlossberg was best known for online trolling including a video questioning whether Second Lady Usha Vance is 'hotter' than his own grandmother Jacqueliine Kennedy and another suggesting JD Vance had killed Pope Francis who died a day after a meeting with the vice president.

He also labeled his cousin Robert F. Kennedy Jr asa 'Russian asset'.

The Daily Mail reached out to Schlossberg's campaign but didn't hear back immediately.