Artificial intelligence will be a key factor driving the company's fundamentals higher, one researcher believes.An analyst recommendation upgrade was the news propelling the stock of Cisco Systems (CSCO 4.25%) skyward on Wednesday. Investors took the bullish new rating to heart, pushing into shares of the veteran computer networking company and sending them more than 4% higher in price. That performance was much better than the 0.5% rise of the S&P 500 index that day.Citi becomes bullishWell before market o ...