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In 1860, Harlan switched parties again to the Constitutional Union Party and supported its candidate, [[John Bell]], for president.<ref name="ANB"/> He supported the party because it supported the Union as opposed to succession but opposed abolitionism.<ref name="ANB"/> During the [[Civil War]], Harlan was a strong supporter of remaining in the Union, and in September 1861, he "formed the Tenth Kentucky Volunteers, serving as the unit's colonel and seeing action in both his home state and [[Tennessee]]."<ref name="ANB"/> In February of 1863, president [[Abraham Lincoln]] "recommended to Congress that Harlan be promoted to brigadier general," however, due to the recent death of his father, Harlan declined the nomination and resigned from the army.<ref name="ANB"/>

In 1860, Harlan switched parties again to the Constitutional Union Party and supported its candidate, [[John Bell]], for president.<ref name="ANB"/> He supported the party because it supported the Union as opposed to succession but opposed abolitionism.<ref name="ANB"/> During the [[Civil War]], Harlan was a strong supporter of remaining in the Union, and in September 1861, he "formed the Tenth Kentucky Volunteers, serving as the unit's colonel and seeing action in both his home state and [[Tennessee]]."<ref name="ANB"/> In February of 1863, president [[Abraham Lincoln]] "recommended to Congress that Harlan be promoted to brigadier general," however, due to the recent death of his father, Harlan declined the nomination and resigned from the army.<ref name="ANB"/>

Three weeks after resigning from the Union army, Harlan was nominated by the Union Party for the position of Attorney General of Kentucky, and he easily won the election.<ref name="ANB"/> For the 1864 presidential election, Harlan supported Democrat [[George McClellan]] for president against Lincoln, due to the latter's support of the [[Emancipation Proclamation]] and the [[Thirteenth Amendment]].<ref name="ANB"/> Harlan's support for the Democratic Party would soon fade due to the party's support for letting former Confederates take part in state politics.<ref name="ANB"/> Harlan then ran unsuccessfully for both the U.S. Senate in January 1867 and for re-election as Attorney General in 1868 as a Conservative Unionist.<ref name="ANB"/>

Three weeks after resigning from the Union army, Harlan was nominated by the Union Party for the position of Attorney General of Kentucky, and he easily won the election.<ref name="ANB"/> For the 1864 presidential election, Harlan supported Democrat [[George McClellan]] for president against Lincoln, due to the latter's support of the [[Emancipation Proclamation]] and the [[Thirteenth Amendment]].<ref name="ANB"/> Harlan's support for the Democratic Party would soon fade due to the party's support for letting former Confederates take part in state politics.<ref name="ANB"/> Harlan ran unsuccessfully for both the U.S. Senate in January 1867 and for re-election as Attorney General in 1868 as a Conservative Unionist.<ref name="ANB"/>

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"/>