The germ of it all was a post by the NYT... It seems to fit the definition of propaganda.
It was reworked a bit to make it more reasonable...
Finally, the co-founder of Mathematica makes a demo that allows you to factor several things into the mix: inflation, policy implementation lag, dividends, etc... The bottom line is:
It doesn’t matter who is in charge, the market is saying, in the long run it’s going to be OK.