Senter initially supported the
Radical Republican initiatives of Governor William G. Brownlow, which included the disfranchisement of ex-Confederates. Brownlow resigned as governor on February 25, 1869, and departed for
Washington, D.C., to take his seat in the Senate. Under the Tennessee Constitution, the Speaker of the Senate is the first in the gubernatorial line of succession, and thus Senter became governor following Brownlow's resignation. Brownlow's radical policies of disfranchisement had left the state divided and had led to the rise of the
Ku Klux Klan. In his inaugural address, Senter vowed to aggressively pursue the Klan and quell Klan violence. In May 1869, however, he disbanded the state guard, which had been fighting the Klan, but had become unpopular. He also announced he supported restoring the voting rights of former Confederates. Since Brownlow was near the end of his term as governor when he resigned, Senter was thrust into a reelection campaign within a few weeks of taking office. His relatively lenient policies toward former Confederates led to a rift in the state's Radical Republican ranks, as many Radicals wanted to continue Brownlow's policies and feared retribution if ex-Confederates and Democrats should once again control the state. At the Radicals' tumultuous convention on May 20, 1869, they were unable to agree on a candidate for governor. In subsequent separate conventions, the Radicals who favored continuing Brownlow's policies nominated
William B. Stokes, and those who favored more lenient policies nominated Senter. Under Brownlow, the legislature had given the governor the power to appoint county election commissioners, who were charged with ensuring former Confederates did not vote. Using this power, Senter replaced nearly three-fourths of Brownlow's commissioners. While the law still technically forbade ex-Confederates from voting, Senter's new commissioners did not enforce this law. Thus, with large numbers of former Confederates now voting, Senter easily defeated Stokes on election day by a vote of 120,333 to 55,036. To address issues over voting and disfranchisement, a new state constitutional convention convened in 1870. This convention, among other things, modified the state constitution to allow all men of at least 21 years of age (whether white or black) to vote, though it also instituted a
poll tax, and ordered separate schools for white and black children. The new constitution was approved by a 98,128 to 33,972 vote. Along with voting issues, one of Senter's primary concerns was the state's rising debt. In December 1869, Senter called for prison reform, arguing that prisons had become a financial drain on the state. Hoping to encourage immigration into the state and increase property tax revenues, Senter established the Tennessee Immigration and Labor Association in February 1871. He also favored initiatives to help railroads struggling to pay interest on state-issued bonds. In 1870, Senter used his influence to help establish
Hamblen County, which was created from parts of Grainger,
Jefferson, and
Hawkins counties. Senter's home was located within the new county. ==Later life==