Democrat Gretchen Whitmer says she won't be part of an expected crowded Democratic field of presidential candidates in 2028 By JOEY CAPPELLETTI Associated Press MACKINAC ISLAND, Mich. -- Democratic Gov. Gretchen Whitmer of Michigan put to rest speculation about a potential 2028 presidential bid, saying Thursday that she will not join what is expected to be a crowded primary field after leaving office at the end of this year. Whitmer has long been viewed by some Democrats as a possible White House contender after her decisive election victories in the closely contested state that Republican Donald Trump has carried twice in presidential votes. For months, however, Whitmer had offered only cautious answers about her political future. But she delivered her clearest response yet in an interview Thursday with Fox 2 Detroit. “I think there will be a robust group of people running for president. I will not be one of them in 2028,” Whitmer said.…