Post-governorship
After leaving office, Hamilton switched to the regular Republican Party. He served on the Texas Constitutional Convention of 1868–69 and on the Republican National Executive Committee. He reversed his views on black suffrage, withdrawing his support for it. After losing the Gubernatorial election in 1869, Hamilton served as the leader of Tax-Payers' Convention in 1871.
Andrew Jackson Hamilton died in Austin, Texas on April 11, 1875 of tuberculosis. He is buried at Oakwood Cemetery.
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