“Morning Joe” hosts Mika Brzezinski and Joe Scarborough sparred about whether or not Democrats are itching to replace President Joe Biden with a different candidate in the next presidential election.Thursday’s episode began with a discussion about a new poll in which Trump leads in the GOP primary by more than 10 points over rivals Ron DeSantis and Nikki Haley. Noting that Trump is proposed to have a wide positive margin in the primaries but a more difficult time clinching the win for the general, Scarborough broke the poll down by making a comparison to Biden.“I find the most fascinating thing about this presidential race is, you have the presumptive nominees in both parties – one a sitting president – with people in their own party going, ‘I like him, I’m very grateful for what he’s done – I hope we can find someone else,'” Scarborough said, in reference to Biden and Trump.“Democrats are saying that about Joe Biden wherever you go, they do it every two weeks,” he added.At that point, co-host Brzezinski cut in.