President Donald Trump has repeatedly touted the strong stock market performance since his election victory as proof of his success. Detractors may point to the Dow Jones industrial average's recent stumbles, but the benchmark index has much further to fall before Trump's postelection gains are gone. The Dow declined by 1,175 points, or down 4.6 percent on Monday. From its high on Jan. 26 at 26,616.71, the benchmark index has declined nearly 2,300 points or 8.5 percent through Monday's close at 24,345.75. Trump still has a big cushion. The Dow closed at 18,332.74 on Election Day, Nov. 8, 2016, which...