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 and Al Gore in their presidential bids but he is making the switch now because he thinks Romney understands the business world -- minus China -- better than President Barack Obama.
Andreessen said he has given $100,000 to the Romney campaign via Super PAC.