For anyone shocked by the idea Iowa could possibly be progressive:

In the first reported case of the Supreme Court of the Territory of Iowa, In re Ralph, 1 Morris 1 (Iowa 1839), we refused to treat a human being as property to enforce a contract for slavery and held our laws must extend equal protection to persons of all races and conditions. 1 Morris at 9. This decision was seventeen years before the United States Supreme Court infamously decided Dred Scott v. Sandford, 60 U.S. (19 How.) 393, 15 L. Ed. 691 (1856), which upheld the rights of a slave owner to treat a person as property. Similarly, in Clark v. Board of Directors, 24 Iowa 266 (1868), and Coger v. North West. Union Packet Co., 37 Iowa 145 (1873), we struck blows to the concept of segregation long before the United States Supreme Court’s decision in Brown v. Board of Education, 347 U.S. 483, 74 S. Ct. 686, 98 L. Ed. 873 (1954). Iowa was also the first state in the nation to admit a woman to the practice of law, doing so in 1869. Admission of Women to the Bar, 1 Chicago Law Times 76, 76 (1887). Her admission occurred three years before the United States Supreme Court affirmed the State of Illinois’ decision to deny women admission to the practice of law, see Bradwell v. Illinois, 83 U.S. (16 Wall.) 130, 139, 21 L. Ed. 442, 445 (1873), and twentyfive years before the United States Supreme Court affirmed the refusal of the Commonwealth of Virginia to admit women into the practice of law, see Ex parte Lockwood, 154 U.S. 116, 118, 14 S. Ct. 1082, 1083, 38 L. Ed. 929, 930 (1894).

From p. 17 of today's opinion in Varnum v. O'Brien (.pdf file).