 Henderson left national politics in 1988 and did not campaign in that year's election after serving in the 31st and 32nd Canadian Parliaments.Henderson was parliamentary secretary for the Minister of Fisheries and Oceans from 1980 to 1981 and for the Minister of Defence from 1982 to 1983.His son Robert was elected to the Prince Edward Island legislative assembly on 28 May 2007, in that province's election.