Maine's Graham Platner is the Democratic candidate for what's considered one of the nation's most competitive battles for the U.S. Senate. Platner, who is challenging incumbent Sen. Susan Collins, is shown at a rally at the Holiday Inn by the Bay in Portland on April 18, 2026. (Photo by Jim Neuger/ Maine Morning Star) Democrats are growing hopeful they can recapture the U.S. Senate in this fall’s midterm elections amid President Donald Trump’s p…