Speaking to a crowd of more than 6,000 at a Labor Day rally in Portland, U.S. Sen. Bernie Sanders of Vermont railed against what he said is an oligarchy of billionaires exerting too much influence over America’s economy, politics and the media. The event was part of Sanders’ nationwide “Fighting Oligarchy” tour. He also used the event to effectively endorse the campaigns of two statewide candidates in Maine: former Senate President Troy Jackson, who is running for governor, and Graham Platner, a