President Obama and first lady Michelle Obama greet astronaut Mark Kelly, husband of wounded Democratic Rep. Gabrielle Giffords, at the National Prayer Breakfast in Washington on Thursday. Failures while in the White House have prompted him to question God's plans for him, the president said. (Associated Press)

President Obama and first lady Michelle Obama greet astronaut Mark Kelly, husband of wounded Democratic Rep. Gabrielle Giffords, at the National Prayer Breakfast in Washington on Thursday. Failures while in the White House have prompted him to question God's plans for him, the president said. (Associated Press)