The campaign for the forthcoming special election to succeed Rep. Mark E. Green is heating up as the Tennessee Republican last week formalized his plans to step down. Green said in a video on social media Friday that he would be resigning his 7th District seat and relinquishing his chairmanship of the Homeland Security Committee

A crush of candidates launched campaigns in recent days to replace U.S. Rep. Mark Green, who made his retirement official last week. Why it matters: Green's retirement will trigger a special election,