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Through a procedural vote, the Senate rejects a constitutional amendment to ban gay marriage, 49-48. That was one vote more than they got last time the Senate voted on the matter, in 2004. But 67 votes, a two-thirds majority, are required to pass a constitutional amendment.

Iran has enriched uranium -- and defied the U.N. Security Council, says the International Atomic Energy Agency. The finding sets the stage for a showdown in the Security Council, which is expected to meet next week to discuss punitive measures against the Islamic republic.

Protests against proposed changes to immigration law take place in Washington, D.C., and other cities. A march to the National Mall is among the largest. Michele Norris spoke with demonstrators as they boarded buses in Maryland, headed for Washington.

The astronauts of the shuttle Discovery spent the third day of their mission moving tons of cargo into the International Space Station. They docked at the station after putting the shuttle through a back-flip. But the astronauts say they first had to overcome a snag: a bad thermostat on a thruster.

A doctor and two nurses were arrested overnight in New Orleans, where they are charged with second-degree murder in connection with patient deaths at a city hospital. The deaths occurred in the chaotic days after Hurricane Katrina.

A national heat wave has Americans dripping in sweat from San Diego to Boston and the strain on the electrical grid is causing power outages. Record amounts of electricity are being used today, and air quality in some regions is reaching unhealthy levels.

Members of Congress hope to block a deal that would place control of several U.S. ports in foreign hands. Dubai Ports World has agreed to buy a company that operates six major seaports. Federal officials insist the purchase does not pose a security risk.

Marine Gen. Michael Hagee is on his way to Iraq to talk to his troops about using lethal force "only when justified." The trip comes amid allegations that Marines killed unarmed Iraqi civilians in two separate incidents. The military has opened investigations into the deaths.

Iraqi police have found at least 85 bodies, killed execution-style, in a Shiite neighborhood in the Sadr City area of Baghdad. Host Alex Chadwick discusses the mass execution and ongoing Shiite-Sunni Muslim sectarian violence in Iraq with New York Times reporter Ed Wong, reporting from Baghdad.

Florida has suffered a rash of alligator attacks in the past week. A jogger was killed last week in Fort Lauderdale, and two other women were killed in two separate alligator attacks this weekend. Melissa Block talks with Nick Wiley, director of the Hunting and Game Division of the Florida Fish and Wildlife Commission.