MACKINAC ISLAND, MI — Rand Paul won the presidential preference straw poll this weekend at the Mackinac Republican Leadership Conference, a biennial gather of more than 2,000 Michigan Republicans. With 785 attendees voting, the U.S. Senator from Kentucky received 22 percent of the vote in the MIRS/Detroit News straw poll. Former Hewlett-Packard CEO Carly Fiorina finished second at 15 percent. Each of the top five vote-getters spoke at the island event, including Ohio Gov. John Kasich (13.7 percent), Sen. Ted Cruz of Texas (13 percent) and former Florida Gov. Jeb Bush (9.7 percent). John Yob, national political director and Michigan...