From RiskHedge

“So let’s steer clear of opinion and emotion. Instead, I want to focus solely on the facts that are relevant to you as an investor. As you’ll see, you don’t need to waste even one second worrying about which party will win on Tuesday. I was surprised by what we found.
Since 1946, there have been 18 midterm elections. Stocks were higher 12 months after every single one. Every single one. That’s 18 for 18. Even though we’ve had every possible political combination in the past 72 years. Republican president with Democratic Congress. Democratic president with Republican Congress. Republican president and Congress. Democratic president and Congress.
Since 1946, stocks have risen an average of 17% in the year after a midterm. And if you measure from the yearly midterm lows, the results are even better. From their lows, stocks jumped an average of 32% over the next 12 months. For perspective, that’s more than double the average performance for stocks in all years. We’re also entering the third year of a presidential term, which is historically the strongest year for stocks.”