Political newcomer Graham Platner has more than twice the support of Gov. Janet Mills among Democratic primary voters, according to the first public polling on the race that could determine who challenges U.S. Sen. Susan Collins for her seat in 2026. The poll released Thursday by the University of New Hampshire Survey Center showed 58% of Democratic primary voters said they plan to support Platner, a military veteran and oyster farmer from Hancock County, while 24% favored Mills, who is nearing the end of her second term as governor. The survey of just under 1,100 Maine residents, including 510 likely...