sentences:  On January 12, 2007, Marchand announced his intention to seek the U.S. Senate seat then held by Republican John E. Sununu.After former governor Jeanne Shaheen entered the race in September, however, Marchand withdrew from the campaign and endorsed Shaheen, who went on to defeat Sununu in the general election.During the 2008 New Hampshire presidential primary, Marchand endorsed Democratic presidential candidate, Governor Bill Richardson.