Endeavour's launch delayed until Sunday

Kennedy Space Center has confirmed that Space Shuttle Endeavour's launch has been scrubbed and rescheduled for Sunday.

NASA managers and engineers were discussing an issue with two heaters associated with shuttle's Auxiliary Power Unit (APU) 1.

Commanding Endeavour on NASA's next-to-last shuttle flight is Navy Capt. Mark Kelly. He's married to Rep. Gabrielle Giffords, who will watch the launch from Kennedy Space Center. She was shot in the head in January and left rehab behind for the liftoff.