Facebook funder and Netscape co-founder says he is putting his money behind Mitt Romney.From Google to Facebook to Apple, the Silicon Valley has a long reputation for leaning left. But one man behind the scenes of several of the valley's most successful companies is tilting the other way. Netscape founder and tech entrepreneur Marc Andreessen said he is putting his financial support behind Republican presidential candidate Mitt Romney in an interview with CNBC. "I turned 40 last year and so I figured it was time to make the switch," the Andreessen-Horowitz co-founder said. He said he previously supported Bill Clinton...