Question: The 2008 Montana gubernatorial election was held on which date, to elect the governor and lieutenant governor of the U.S. state of Montana, the Republican nominee was Roy Brown, Brown's running mate was businessman, and future U.S. Representative and U.S. Senator Steven David Daines, is an American businessman, entrepreneur, and the junior United States Senator from Montana?
Sentence (from "Steve Daines"): He was the United States Representative for Montana's at-large congressional district from 2013 to 2015.
Relevant evidence: No