The U.S. presidential election has proven to be a positive catalyst for the stock market. Since Nov. 5, the S&P 500 has risen by 5% as of Monday. But one stock that hasn't been doing well since then is Nvidia (NVDA 1.37%), which has gone in the opposite direction, declining by more than 6%.It's unusual territory for Nvidia to be in, as it has been among the hottest growth stocks to own, especially in recent years. Are its recent struggles a sign that it has finally hit a peak?A strong earnings report may no ...