"There's a 60% chance, more likely than not, that he's going to stay in," Gardner told CNBC's " Fast Money " on Monday.
There's a 40% chance President Joe Biden will not seek reelection, according to Stifel.
They can try to persuade Mr. Biden to drop out of the race, but they cannot force him out," Gardner told clients on Monday.
If Biden stays in the race, however, Gardner contends the Democratic Party may still see a favorable outcome.
"There's a certain level of voter that is just never going to vote for Donald Trump no matter what," Gardner said.
Persons:
Gardner, CNBC's, Biden, Brian Gardner, There's, Joe Biden, Mr, Biden's, Donald Trump
Organizations:
Democratic Party, Oval
Locations:
Washington