On today's 'BradCast', long-time Bernie Sanders supporter, columnist and editor of The Prospect responds to concerns that some Sanders supporters may be undermining Bernie, and offers historical examples for why those supporters may want to think twice before choosing to sit out this election (or vote for Donald Trump or a third-party candidate), in the event their candidate doesn't win the Democratic nomination. Also today: A host of new polls suggest, once again, that Hillary Clinton is likely to have a very tough time against Donald Trump this November; Anti-Trumpers continue coming around to Trump; Bad news for the fight against Photo ID voting restrictions in VA; Good news for progressives concerned about the Democratic Party platform at the convention in July; and climate change-related extreme weather kills scores in Bangladesh and Sri Lanka, and threatens many more across the planet...