Elizabeth Warren backs Mallory McMorrow in Michigan Senate primary

Massachusetts Sen. Elizabeth Warren is wading into Michigan's closely contested Democratic Senate primary, backing state Sen. Mallory McMorrow over two rivals.

It's a somewhat counterintuitive endorsement for the progressive U.S. senator who has made her backing of Medicare for All a core part of her political identity. McMorrow opposes Medicare for All, while Abdul El-Sayed, one of McMorrow’s opponents, supports it.

But the endorsement is a coup for McMorrow as she seeks to win...