He became active in
Whig politics and was elected to a two-year term as
prosecuting attorney for the Third Circuit Court of
Arkansas Territory beginning September 13, 1833. He was re-elected in 1834, but resigned following election to the
9th Arkansas Territorial General Assembly. Walker was elected to the state
constitutional convention which authored the
1836 Arkansas Constitution. Walker also engaged in
land speculation and other business with
Archibald Yell, another prominent early settler of Fayetteville. Together Walker, Yell, and William Haile founded the town of
Ozark, Arkansas in the
Arkansas River Valley, and later using political power to establish the Ozark Turnpike Company, which built a road between Fayetteville and Ozark which was subsequently designated as
Arkansas Highway 23 and known as the
Pig Trail Scenic Byway. Walker won election to the
Arkansas Senate in 1839, representing Washington County alongside two other men, and served in the
3rd Arkansas General Assembly and the
4th Arkansas General Assembly. Walker resigned from the General Assembly to run for
Arkansas's at-large congressional district in the
1844 election as the Whig party candidate. Yell sought the seat for the Democrats, having held the seat as a
Arkansas's first congressman after statehood in 1836, now seeking a return following two terms as
Governor of Arkansas. The bumptious Yell defeated a restrained, Whiggish Walker, though the two avoided personal attacks during the campaign. Having become one of the most wealthy citizens in the region, in addition to his law practice, Walker raised cattle and grew grains and fruit on a farm on the West Fork of the
White River with twenty-three slaves. Though he detested the largely corrupt
Democrats, he also vehemently opposed the national
Republican platform toward slavery, which was impotent in Arkansas. Walker, along with other former Whigs, began to support the
Constitutional Union Party as secession grew in prominence. ==Secession Convention==