Morris was active in the public life of Carmarthen for many years before his election to Parliament and served as mayor of the borough on four occasions.[3]
Morris was elected MP for Carmarthen Boroughs at a by-election in 1864, after his cousin David Morris died in office.[4] Although there was speculation about several other possible candidates, requisitions inviting Morris to fill the vacancy appeared almost immediately after the former member's funeral.[5]
He then held the seat until 1868 when he did not stand for re-election.[6]