Tea Party-backed Senate candidate Ted Cruz points with pride to the army of small conservative donors supporting him. But his largest longtime contributor is a gay billionaire who supports same-sex marriage and marijuana legalization, campaign finance filings show. Peter Thiel, a German-born hedge fund manager and founder of the online payment system PayPal, gave Cruz $251,000 in 2009 for his aborted run for attorney general. The money represented 19 percent of the total raised for that campaign, which Cruz ended after Attorney General Greg Abbott decided to run for re-election. Thiel’s political and financial support for gay rights and legal...