If you're a Fortune 100 CEO, you're a very smart, hard-working, highly successful person. That, of course, doesn't mean that millions of other people aren't also all of those qualities, but if I were running for president, I would want the support of all 100 of them. You (should) always want the smart, successful people on your side.
Because one thing they really don't like is uncertainty and instability? They know pretty much what they're going to get with Clinton and what the effect on the economy is likely to be. With Trump, all bets are off.
