U.S. stocks were mixed Tuesday, with the Nasdaq rising modestly, the broader Standard & Poor's 500 flat, and the Dow industrials declining for the first time in four sessions. The Dow Jones industrial average fell 71.45, or 0.3 percent, to 26,186.97. The S&P 500 index was virtually unchanged, rising 0.05 to 2,867.24. The technology-heavy Nasdaq composite index rose 19.78, or 0.25 percent, to 7,848.69.