WASHINGTON, July 31 (Reuters) - More than 100 venture capitalists including entrepreneur Mark Cuban threw their support behind U.S. Democratic presidential candidate Kamala Harris on Wednesday, a counterweight to tech billionaires backing Republican rival Donald Trump.

We are pro-business, pro-American dream, pro-entrepreneurship, and pro-technological progress. We also believe in democracy as the backbone of our nation. We believe that strong, trustworthy institutions are a feature, not a bug, and that our industry - and every other industry - would collapse without them.

Silicon Valley has traditionally been seen as a liberal bastion.