Keane could play no other part than that of a nominee in either Parliament. He was initially returned for Bangor by Lord Grandison, duly going into opposition when his patron failed to be made governor of Waterford. In 1797 Lord Shannon returned him for Youghal and he remained thereafter a not particularly active member of the Shannon parliamentary squad. He supported the Union and, at Westminster, Addington’s administration, which made him a baronet.
While ensuing administrations claimed him as a supporter, they found him an unreliable attender. Edward Lee, while claiming that Keane supported ministers, thought fit to apply himself to government, though not a Member, for a favour for Keane’s brother in 1812.
