In regards to Tesla stock price following election, my guess is the following:
Biden Wins / Republicans keep senate: No EV tax credit changes, no rise in corporate/personal tax rates, CV managed better, US re-enters climate accords = slightly good for markets overall, slightly positive for Tesla Stock Price.
Biden Wins / Democrats take Senate: EV tax credit changes, corporate/personal tax rate increases, CV managed better, US re-enters climate accords = slightly negative or neutral for markets overall, Very positive for Tesla Stock Price
Trump Wins / Republicans keep senate: Status Quo - no EV tax credit changes, no rise in corporate/personal tax rates - possible more tax cuts to come, CV continues running rampant, US remains out of climate accords: would be a surprise result, perhaps big immediate jump in markets & neutral for Tesla stock price.
Trump Wins / Democrats take senate: probably no EV tax credit changes - but possible in a budget negotiation, no rise in corporate/personal tax rates, slightly better oversight of CV response, US remains out of climate accords - good for markets, neutral/slightly positive for Tesla.
(assuming Democrats hold onto power in house of representatives in all scenarios given it is 99% likely)