That ain't battenin' down those hatches. Is this because Clinton will spark the next phase of an historic bull market? Nope. This bull market has already gone on for a rather long period of time, largely because we had a terrifying drop in the financial crisis. Rather, markets and the economy as a whole are only weakly influenced at best by the president, under normal times. The dirty secret here is as follows:
Read the commentariat among the business class and they will whine about how the Fed is keeping interest rates too low. Then, the markets freak the fuck out every time it looks like the Fed might raise interest rates. They rally, then, on news that the Fed won't raise rates. Markets maintain stability as Clinton's lead solidifies while Trump promises to throw out Yellen in favor of someone who will jack up interest rates, doing exactly what investors claim to want, but which causes them to freak out as soon as they worry that it might actually happen. There is more to it, of course, including a general worry about Trump's unpredictability, but that's kind of the point.
So, Clinton is ahead. And, the markets are fine with that. Republican investors are fine with that. Would that be the case if Republicans had nominated Jeb Bush, Marco Rubio, or someone else less Trump-y? Uh... Good question. After all, talk of raising rates is now Republican standard. Would they really push for it where they in charge, or is it kind of like talk of deficit reduction when the president is a Democrat? Uh...