Nvidia's stock has been weak over the past month, but that could change in 2026.Predicting winners in the artificial intelligence (AI) realm over the past few years has been fairly easy. Just pick a stock associated with AI, and chances are you'll have beaten the market. While that's a vast oversimplification, choosing a stock like Nvidia (NVDA 0.59%) or Palantir Technologies, both recognized leaders in their realm, has resulted in market-beating stock returns.However, after so many years of great returns, ...