New data shows just how liberal Silicon Valley donors are

Republicans often talk about how they need to do a better job of making inroads into Silicon Valley—the nation’s tech innovation hub—and there have been plenty of reports in recent years about the progress they've already made.

But new data from Crowdpac, a for-profit company that analyzes political giving, demonstrates just how much more often those in Silicon Valley give to Democrats rather than Republicans.

Crowdpac co-founder Adam Bonica, an assistant professor of political science at Stanford University, between 2010 to 2013 compiled a vast database of over 100 million political contributions made between 1979 and 2012 in local, state and federal elections. (Jon Ward/Yahoo News)