In 1850, Miller moved to
Keokuk, Iowa, which was a state more amenable to his views on slavery, and he immediately freed his few slaves who had come with his family from Kentucky. Active in Iowa politics, he supported
Abraham Lincoln in the 1860 election. Lincoln nominated Miller to the Supreme Court on July 16, 1862. He was confirmed by the
U.S. Senate that same day, and was
sworn into office on July 21. When Chief Justice
Salmon P. Chase died in 1873, attorneys and law journals across the country lobbied for Miller to be appointed to succeed him, but President
Ulysses Grant was determined to appoint an outsider; he ultimately chose
Morrison Waite. In his tribute to Miller delivered in Portland, Oregon, on October 16, 1890,
George Henry Williams stated his support of Miller in detailing his interactions with President
Ulysses S. Grant about Chase's replacement. After the
1876 presidential election between
Rutherford Hayes and
Samuel Tilden, Miller served on the
electoral commission that awarded the disputed electoral votes to the Republican Hayes. In the 1880s, his name was floated as a Republican candidate for president. In the winter of 1889 and spring of 1890, Justice Miller delivered a series of ten lectures on constitutional law at the
National University School of Law in Washington, D.C. They were published posthumously, along with two earlier lectures delivered in 1887. ==Personal life==