Left-wing Democrats are on a winning run - but can they lure back crucial swing voters?

Core point

On a Saturday evening in Michigan, hundreds of voters gathered at Detroit's Opera House to support Senate hopeful Abdul El-Sayed. El-Sayed is running on a platform of universal healthcare, with supporters advocating for 'Medicare for All.' His opponent, Congresswoman Haley Stevens, is an experienced politician backed by significant corporate donations. The outcome of the primary on August 4 will determine who competes against Trump ally Mike Rogers in the November elections.