Dan PrimackPhoto: Eva Marie Uzcategui/Bloomberg via Getty ImagesFounders Fund, the venture capital firm co-founded by Peter Thiel, is raising around $3 billion for its third growth equity fund, Axios has learned from multiple sources.Why it matters: Founders Fund has backed some of the world's most valuable tech startups, including SpaceX and Stripe.It also will have access to the incoming White House, thanks to Thiel's longtime support of President-elect Trump and the firm's numerous investment...