Democratic primaries for critical Senate races are starting to heat up as the party aims to win a majority in this year's midterms . The party’s moderate and progressive divides are on display in the Maine race between Governor Janet Mills and progressive Graham Platner to take on GOP Senator Susan Collins . Candidates are also starting to launch attacks in Michigan’s primary between Representative Haley Stevens, state Senator Mallory McMorrow and progressive candidate Abdul El-Sayed. Meanwhile,