Joe Biden is at risk of being “shuffled out behind closed doors” as repeated gaffes could jeopardise his election campaign, a top pollster has claimed. Biden, 81, is currently storming ahead in the Democratic Party primary race after firebrand candidate Robert F Kennedy Jr pulled out of the contest to stand as an independent. The 46th President is now up against campaigner Marianne Williamson and Minnesota Representative Dean Phillips. Despite facing few challenges in the Democratic primary race, Biden could still find himself not on the ticket come November 5. JL Partners co-founder James Joh…