Business leaders are plotting to take down Rep. Justin Amash (R-Mich.) as part of a broader effort to punish lawmakers over the government shutdown. In a letter obtained by The Hill, prominent Michigan donors request financial backing for Amash’s primary challenger, Brian Ellis. Seven individuals, including prominent Michigan businessmen Mark Bissell, J.C. Huizenga and Mike Jandernoa, signed the fundraising plea. They argue that Amash “and others have effectively nullified the Republican majority in the U.S. House.” “[Amash] and a small group of like-minded legislators rejected Speaker Boehner’s plea to pass legislation requiring Congress and the president be subject to ObamaCare,...