Michigan Democrat Mallory McMorrow, a candidate running for US Senate, deleted thousands of tweets, some of which defended “coastal elites” and were critical of “Middle America,” after The Post first reported on them last year.  Morrow, 39, purged her X account of roughly 6,000 posts, including all her tweets posted prior to 2020, CNN’s Andrew Kaczynski reported on Wednesday.  The journalist noted the social media cleanse came after The Post’s April 2025 scoop on McMorrow’s…