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In 1868, Harlan became a [[Republican Party (United States)|Republican]] and supported [[Ulysses S. Grant]] for president.<ref name="ANB"/>

In 1868, Harlan became a [[Republican Party (United States)|Republican]] and supported [[Ulysses S. Grant]] for president.<ref name="ANB"/>

Although Harlan had opposed succession during the Civil War,<ref name="ANB"/> he supported slavery and opposed the Emancipation Proclamation.<ref name="ANB"/><ref name="PBS">[http://www.pbs.org/wnet/supremecourt/antebellum/robes_harlan.html John Marshall Harlan - Supreme Court History]. ''PBS.org''. December 2006. Retrieved August 27, 2016.</ref> Harlan also opposed the Thirteenth Amendment when it was proposed, on the grounds that it violated state sovereignty.<ref name="ANB"/> However, after the election of Grant as president in 1868, he renounced those views and switched to supporting civil rights, endorsing the Thirteenth and [[Fourteenth Amendment]]s to the United States Constitution.<ref name="ANB"/><ref name="PBS"/>

Although Harlan had opposed succession during the Civil War,<ref name="ANB"/> he supported slavery and opposed the Emancipation Proclamation.<ref name="ANB"/><ref name="PBS">[https://www.pbs.org/wnet/supremecourt/antebellum/robes_harlan.html John Marshall Harlan - Supreme Court History]. ''PBS.org''. December 2006. Retrieved August 27, 2016.</ref> Harlan also opposed the Thirteenth Amendment when it was proposed, on the grounds that it violated state sovereignty.<ref name="ANB"/> However, after the election of Grant as president in 1868, he renounced those views and switched to supporting civil rights, endorsing the Thirteenth and [[Fourteenth Amendment]]s to the United States Constitution.<ref name="ANB"/><ref name="PBS"/>

After his switch to the GOP, Harlan ran several unsuccessful campaigns for office, first for Kentucky governor in 1871, for U.S. Senate in 1872, and for governor again in 1875.<ref name="ANB"/> Despite this, he was rising in political stature, having been widely speculated to be chosen as Grant's running mate in 1872, and being offered the position of U.S. Ambassador to England in 1877 by president [[Rutherford B. Hayes]], whom Harlan had been instrumental in helping to become president.<ref name="ANB"/> Harlan rejected the latter offer in exchange for a nomination to the vacant Supreme Court seat.<ref name="ANB"/>

After his switch to the GOP, Harlan ran several unsuccessful campaigns for office, first for Kentucky governor in 1871, for U.S. Senate in 1872, and for governor again in 1875.<ref name="ANB"/> Despite this, he was rising in political stature, having been widely speculated to be chosen as Grant's running mate in 1872, and being offered the position of U.S. Ambassador to England in 1877 by president [[Rutherford B. Hayes]], whom Harlan had been instrumental in helping to become president.<ref name="ANB"/> Harlan rejected the latter offer in exchange for a nomination to the vacant Supreme Court seat.<ref name="ANB"/>