Fox News only reaches a fraction of the daily news audience. Their audience is not voting for Biden.I don't disagree with you. Biden is old and he the pace of a campaign is gruelling. However, I think he's a decent campaigner, and can sell his message. Trump is looking more and more decrepit, forgetting names of people or even the place he's in. I think if the media applied the same scrutiny to Trump that they do Biden, there would be a lot more concern. And, you just look at how the right-wing media selectively crops videos of Biden to make him look feeble or no connected. It's a sham and bullshit. Truthful reporting has never been Fox's strong suit, but they are sure as fuck amplifying any issues, even if they are made up.
MSNBC, CNN, WaPo and NY Times do a very good job of offsetting biased conservative news reporting. These outlets don't conceal their disdain for Trump. Someone recently posted on this thread MSNBC's Nicolle Wallace commenting how Biden is made to look old by conservative media editing. Once we get past the Democratic convention support for Biden will grow louder and stronger because there will be no going back.
If Biden is a decent campaigner and debater, there should be no problem for his campaign.