> Rogan has previously said he would vote for Trump over Biden and has speculated that Biden is suffering from some sort of cognitive decline.
Biden has done long form podcasts and speeches, I've listened to them - he's not as sharp as he was but he's fine. He's a terrible public speaker, but he's fine.
Trump is also not a gibbering wreck, but - even ignoring the bleach comment - he cannot remember pertinent details from his briefings (Swan interview), he gives away extremely damaging information about himself on the phone to a reporter who he knows despises him (Woodward). He seems to have little to no control over his own actions. I could be more aggressive and cite the Daily Show's compilation of trump looking lost "Where's Rudy" and confused.
The whole reason why they are pushing the sleepy Joe line is because everything the Donald is accused of, they fling back mirrored against the opponent. Donald Trump, ever since his Nuclear speech, has been accused of being mentally deficient so that's their play.
Edit:
Downvote all you like but please counterargue.
Yes, this is the problem, it's always been the problem. Biden is a human gaffe machine, and this derailed his previous Presidential runs. Not sure why Democrats thought he was the "safe" choice. In the past, Biden would have been considered a loose cannon, but of course he seems rather tame compared to Trump. As does anyone compared to Trump.
It's not that the party thinks he's their best bet to win the election, it's that they think it's their best chance to get him elected.