Based on what I heard about Giffords' condition on NPR this morning, there's no chance they should be considering a Senate run for her. She has made great progress but her speaking ability is severely hindered. Her brain works but she can't retrieve words easily. I hope and believe she will recover a great deal in the future and is working toward that, but a major statewide race is not realistic.
She honestly wasn't that great of a candidate to begin with. Democrats would be better off giving Goddard a second chance.