Everyone, and I mean EVERYONE, was a Wile E. Coyote super genius if they bought stocks at the end of March. There are very few stocks you can find out there that did not bounce off that low to reach past the Feb top. Watch all these Coyotes fall to pieces if Biden is elected, and implements his massive tax increases.
TL : DR and completely uninterested to do so, except near the bottom: "Okay, I could probably write much more and I might edit ....." ding ding ding the key to making big buxs editing P&L statements, account balance windows what have you. Next, slap down deposit for Aston Martin DBS Superleggera.
What if (just sayin', not expecting good, bad or indifferent, who after all fng really knows the future) Biden wins and markets continue higher? What if? Was the prior index ATH's (ignoring main real factor number one, survivorship bias) the result of the yuuge Chumpie corp tax and regulation cuts or really just fed printing, bonds & mortgage purchases etc and jawboning to do more the other real reason number two?
Pretty sure a 2017 chart of a major equity index holds the answer to your question. (and Q4 2018, and April through Sep 2020). There is something not normal about it. That will be "fixed" if Biden gets elected and does what he promises, and the Fed starts raising rates again.
Ain't gonna hap'n. Can't. US and world will suffer with rising rates. Fed will do what ever - at all costs. For as long as they can ... hold back the tide.
And who is going to pay the piper for it? Someone has to, and it will be the average American worker! By hook or by crook!
Why would he? He works for the Federal Reserve, a private institution, and he can place his money where he knows the ball will fall on the roulette wheel.