MacMillan served in the Prince Edward Island legislature from 2000–2003, as part of Pat Binns's Progressive Conservative Party of Prince Edward Island government.
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Hilda Ramsay, the first woman ever to stand for election to the Legislative Assembly of Prince Edward Island, was a CCF candidate in 3rd Prince in this election.
Jean Canfield, the first woman ever elected to the Legislative Assembly of Prince Edward Island, was a victorious candidate in First Queens in this election.
He was elected to the Legislative Assembly of Prince Edward Island in the 2007 provincial election and represents the electoral district of Kensington-Malpeque as is a member of the Liberal Party.