In the non-partisan primary held on September 5, 2005, Guinta placed second in a three-candidate field, garnering 3,760 votes to Baines' 5,168. (Jeff Kassel received 651 votes.) On November 8, 2005, Guinta defeated Baines in the general election by 528 votes (10,125 to 9,597), becoming Manchester's youngest mayor in over 100 years. He ran on a platform of improving education, increasing public safety and security, revitalizing Manchester's neighborhoods, promoting fiscal responsibility, and reducing property tax rates. He was inaugurated on January 3, 2006.