https://www.ft.com/content/564c5765-8b19-4fe1-a530-c884f6d7b2eb
The simple fact is that since 1900 (through October 27), $10,000 invested in the Dow Jones Industrial Average only when Republicans were president would have grown to about $100,000 (a 4.0 per cent annualised return. The same $10,000 would have grown to nearly $430,000 if it was only invested when Democrats were president (a 6.1 per cent annualised return). It is technically correct to say that the stock market has performed more than four times better when the Oval Office was “painted blue”.