The average stock in the S&P 500 is up a few percentage points since the close on Election Day (11/8). But not all stocks are up. If you're a "buy the dip" kind of investor instead of a momentum trader, below is a list of the worst-performing S&P 500 stocks since Election Day. Most stocks are down on stock-specific news like earnings, but all of them are down more than 6%. TripAdvisor (NASDAQ:TRIP) tops the list with a drop of 18.51%, followed by Patterson (NASDAQ:PDCO), which fell 16%+ on earnings today. Tyson Foods (NYSE:TSN), Centene (NYSE:CNC) and Medtronic (NYSE:MDT) round out the top five. Other notables on the list of losers include First Solar (NASDAQ:FSLR), Philip Morris International (NYSE:PM), Under Armour (NYSE:UA), Colgate-Palmolive (NYSE:CL) and Intuitive Surgical (NASDAQ:ISRG).