Nebraska and Oklahoma say Colorado's marijuana law is unconstitutional, in a challenge to the law in the Supreme Court. Earlier this month, visitors from Texas smell marijuana at the Breckenridge Cannabis Club. Brennan Linsley/AP hide caption

itoggle caption Brennan Linsley/AP

Sue Barton, a plaintiff challenging Oklahoma's gay-marriage ban, gets a hug from her pastor following a hearing at the 10th U.S. Circuit Court of Appeals in Denver on April 17 Brennan Linsley/AP hide caption

itoggle caption Brennan Linsley/AP

Oklahoma Gov. Mary Fallin issues a statement to the media after the execution of Clayton Lockett. Oklahoma Secretary of Safety and Security Michael C. Thompson stands behind her at the Oklahoma State Capitol in Oklahoma City. Alonzo Adams/AP hide caption

itoggle caption Alonzo Adams/AP

Data released Tuesday shows that the deadly El Reno tornado that struck Friday was the widest every recorded in the U.S., at 2.6 miles. National Weather Service hide caption

itoggle caption National Weather Service

After the storm: Sheet metal that was torn off a building during Friday's tornado in El Reno, Okla., ended up caught in a tree. Bill Waugh /Reuters /Landov hide caption

itoggle caption Bill Waugh /Reuters /Landov