Elizabeth Warren’s Senate campaign has been fueled largely by donations from outside Massachusetts — places like Beverly Hills, the Silicon Valley and New York, where Warren held a fund-raiser last night co-hosted by billionaire investor George Soros. Warren’s campaign raised an impressive $3.15 million from July through September, but just $974,000 — or 31 percent — came from donors in the Bay State, according to her campaign. Nearly 70 percent of her fund- raising came from out-of-state donors, including Hollywood stars like Barbra Streisand, and out-of-state political action committees. Many of her contributions come from places where the rich and...