An early supporter of the [[Radical Republican]] faction of the GOP, Houk backed staunch abolitionist and civil rights advocate [[Ulysses S. Grant]] in the [[United States presidential election, 1868|1868]] and [[United States presidential election, 1872|1872]] presidential elections.<ref name=tennesseeencyclopedia/>
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A supporter of the [[Radical Republican]] faction of the GOP, Houk backed staunch abolitionist and civil rights advocate [[Ulysses S. Grant]] in the [[United States presidential election, 1868|1868]] and [[United States presidential election, 1872|1872]] presidential elections.<ref name=tennesseeencyclopedia/>