Presidents take too much credit and receive too much blame. Contrary to your opinion, Presidents are not dictators. Example? Nixon. While he won the electoral college in a landslide, his party didn't win the Senate nor the House so that affected how much he could do. Same with President Obama, he lost the House after only a couple of years.
And the stock market is only one sign of a robust economy. Right now I believe it is overvalued because the interest rates have been held to artificial lows. No place to put your money for decent returns unless it is in the stock market.
Thomas Sowell: There are no solutions, just trade-offs.