Former Vice President Dick Cheney walked onstage without any assistance and spoke for an hour and 15 minutes without seeming to tire in his first public engagement since he underwent a heart transplant three weeks ago. "He has been an unmitigated disaster to the country," Cheney said of President Barack Obama. "I can't think of a time when I felt it was more important for us to defeat an incumbent president today with respect to Barack Obama. I think he has been an unmitigated disaster to the...