When an election looms, we can often see candidates scrambling to find any advantage they can use against their opponents. And sometimes, the lengths they go to can be frankly ridiculous.
Even if you forgot that Howard Dean's whole campaign in the 2004 Democratic Primary was apparently derailed by a weird scream he made after a loss in Iowa, it's hard not to forget that even Barack Obama's preference for Dijon mustard was once put under a microscope.
But sometimes, what can seem like a petty attempt to make a mountain out of a molehill can address a serious question about a candidate's fitness to lead. And it's through that lens that Joe Biden has seen fit to talk about President Donald Trump's physical fitness.