Feb. 12, 2013, 12:52 p.m. EST By Wallace Witkowski and Polya Lesova, MarketWatch SAN FRANCISCO (MarketWatch) — U.S. stocks rose Tuesday, once again testing resistance levels, as financials rallied and tech stocks were weighed down following Apple Inc.’s appearance at an investment conference. Earlier, the major U.S. stock indexes struggled for direction, with Coca-Cola Co. (NYSE:KO)  weighing on the Dow…