U.S. Sen. Elizabeth Warren’s PAC has raised tens of thousands of dollars from wealthy Democrats, including a top President Obama donor and a close friend of Hillary Clinton’s — even as the Bay State lawmaker travels the country blasting big business and the super rich. Among the most recent donors with the deepest pockets who gave to Warren’s PAC for a Level Playing Field, according to its latest federal filing: • Barbarina Heyerdahl, a Democratic activist in Vermont who has given heavily to President Obama. She gave $5,000 to Warren’s PAC last month; Heyerdahl has donated more than $190,000 to...