Former Maine Senate President Troy Jackson officially secured the Democratic nomination for the U.S. Senate on Sunday, capping off a fast-moving replacement process that began after Democratic nominee Graham Platner withdrew from the race earlier this month. Meeting at the Cross Insurance Center in Bangor, Democratic delegates overwhelmingly selected Jackson as their nominee, giving him 566 votes to 5 votes for fellow candidate Saundra Pelletier. The decisive margin ended weeks of speculation over who would replace Platner on the November ballot and sets up a high-profile general election against six-term U.S. Sen. Susan Collins (R-Maine). Jackson accepted the nomination before...