WASHINGTON, July 27 (UPI) -- U.S. Sen. Chuck Hagel, R-Neb., Sunday defended presumptive Democratic presidential nominee Barack Obama from recent political attacks. Hagel said during an appearance on CBS's "Face the Nation" that U.S. Sen. John McCain, R-Ariz., the likely GOP nominee, was pushing the ethical envelope by questioning the Illinois senator's motivations for opposing the Iraq war. "I think John is treading on some very thin ground here when he impugns motives, when we start to get into, 'You're less patriotic than me' and 'I'm more patriotic.' I admire and respect John McCain; we talk often. John's better than...