Republican Ron Paul, who developed a strong base of support in his failed bid for the nomination, refused to endorse John McCain and asked his supporters to consider a third-party candidate. “Third-party candidates tend to do best when there is significant dissatisfaction with the major-party nominees ‘This doesn’t strike me as a year where people in either party are dissatisfied with their candidate,’ said G. Calvin Mackenzie, a political science professor at Maine’s Colby College.”