AMES — "This is not a game,” Ta-Nehisi Coates warned. “This is catastrophic.”That was one of the more dire messages that renowned author Ta-Nehisi Coates delivered on the Iowa State University campus on Monday night, peppering his speech with proclamations of hope, arguments for action and insistence on historic reflection.“Elections have consequences,” Coates, a national correspondent at The Atlantic and author of “Between the World and Me,” said during his hour-and-a-half speech before a packed crowd of more than 1,100.“Elections are not always a choice between good or gooder or goodest.