A big example would be Prop 8. After courts ruled there was a constitutional right for gay marriages, a slim majority voted to pass an amendment to the state constitution banning gay marriage. This was ruled unconstitutional by a federal court. It was really weird because at the time, gay marriage was not a constitutional right nationally, so the federal courts were essentially ruling "gay marriage doesn't need to be allowed in your state, but if it is, you can't take away the right".