The ACLU filed a lawsuit challenging Kansas’ dual voter registration system, charging it violates the Kansas Constitution and state law. The dual system prevents qualified Kansas voters from voting in state and local elections due solely to their method of registration. In mid-July, Secretary of State Kris Kobach received administrative approval of a temporary regulation aimed at formalizing this system, which a court has already declared violates state law.

On September 21, 2013 the American Civil Liberties Union and the ACLU of Kansas filed a lawsuit challenging Kansas' two-tiered voter registration system. The complaint charges that eligible voters are being divided into separate and unequal classes, in violation of the Kansas Constitution's equal protection guarantees.

The American Civil Liberties Union and the ACLU of Kansas have filed a lawsuit against district court clerks in Douglas and Sedgwick counties for their refusal to issue marriage applications to two same-sex couples, despite the Tenth Circuit Court of Appeals lifting its stay on marriage for same-sex couples.