This is AP News Minute. 

President Obama has officially launched his re-election bid. The two-minute video on his campaign website which doesn't feature the president calls for volunteers to start organizing for 2012. Obama's campaign is expected to file formal paperwork with the Federal election commission this week.

Southwest airlines expected to cancel more flights Monday while dozens more of their Boeing 737-300s are checked for cracks. Investigators suspect the crack caused a plane to lose pressure Friday, tearing a hole in the passenger cabin roof. The pilot made an emergency landing in Arizona. Similar cracks have been found in three other planes.

High winds and high temperatures have fueled grass fires in the Midwest. An entire town in Kansas and another in Oklahoma had to be evacuated because of separate fire threats. Some rain and cooler air today could help firefighters battle the flames.

And the royal couple will get a serenade after their nuptials. Guests at Queen Elizabeth's reception will hear Clare Jones, the official harpist to Prince Charles. She'll be asked to perform as the newlyweds and their guests arrive for the lunchtime gathering in the palace's ornate state rooms.

Ed Donahue, the Associated Press with AP News Minute.

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