“Democrats in Maine have reset a Senate race seen as critical to their party’s chances of retaking the chamber after an improvised scramble to swap out a damaged candidate, Graham Platner, for a new one, Troy Jackson, after a wild 17 days,” the New York Times reports.“Now comes the tricky part.”“Mr. Jackson, a former State Senate president, is trying to keep alive the grass-roots energy that Mr. Platner built over the past year while distancing himself from the former nominee’s personal history. With help from her allies, Senator Susan Collins, the five-term Republican he is trying to defeat, is seeking to tie the two Democrats together in ways the G.O.P. hopes will alienate swing voters.”