Warren challenges Sanders for progressives' 2020 support

LANSING, Mich. (AP) — As a Michigan field organizer for Bernie Sanders' 2016 presidential campaign, Mike McDermott trained volunteers to knock on doors and call voters, helping the Vermont senator upset Hillary Clinton in a crucial Midwestern state.But as the 2020 campaign heats up , McDermott is all-in for Massachusetts Sen. Elizabeth Warren, creating a Michigan for Warren PAC to raise early money for her efforts and promoting her campaign through a website and Facebook page. While he's s