Wall Street is flirting with a record on Tuesday, as stocks zigzag under the market's surface following mixed profit reports from UnitedHealth, General Motors and other big companies. The S&P 500 rose 0.

US stock futures mostly moved higher on Tuesday as tech hopes offset a growing list of political worries, with a slide in UnitedHealth (UNH) dragging on the Dow and Wall Street weighing a long-awaited...