The SP500 is probably the most popular investment in America, perhaps aside from housing. Wouldn't hurt to have lawmaker's fortunes broadly aligned versus narrowly aligned with specific corporations.
Whenever the S&P 500 craters, it is the best time to buy. Warren Buffet talks about it all the time: "Don't bet against America." There is no other large rich nation on Earth with such a dynamic economy. That (partly) explains why the US can bounce back so quickly (compared to other countries) from devastating economic downturns.