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 "Roy Brown (Montana politician)"): Roy Brown (born February 16, 1951 in Casper, Wyoming) is a former Montana State Senator from Billings, Montana Senate District 25.
Relevant evidence: No