27th Amendment

copied from: http://www.archives.gov/exhibits/charters/constitution_amendments_11-27.html

Originally proposed Sept. 25, 1789. Ratified May 7, 1992.
No law, varying the compensation for the services of the Senators and Representatives, shall take effect, until an election of representatives shall have intervened.

The 27^th Amendment states that no Law that would pay Senators and Representatives more or less in income will be allowed to happened until after another election. This amendment took almost 200 years after its proposal to be ratified due to the Supreme court case of Coleman v. Miller where the court ruled that If an amendment had an unspecified date then the state legislatures could approve the amendment at any time. 

Congress gets to change their pay as long as its after the next election. 

Congress freezes its pay. Violation of the 27th Amendment/