That's a strange remark. So if the President hasn't been "bought" by Wall Street, then the stock market would go down I take it. Why would that be?
Not necessarily. The "stock market" is a giant marketplace that is strongly influenced by politics, but is still driven by market dynamics.
Good investors can make a lot of money in a flat market -- or even in a declining market.
Buying political leaders just gives major corporate players less risk. They can use the political realm to rig the market in their favor.