Joe Biden's brain surgeon is defending Joe Biden's brain

Enough with the worrying, former Vice President Joe Biden's brain surgeon says. As some voters murmur that the gaffe-prone Democratic presidential candidate's age is cause for extra concern this campaign cycle, Dr. Neal Kassell -- the man who performed surgery on Biden three decades ago following two brain aneurysms -- came out swinging for his former patient. Kassell dismissed fears about the 76-year-old Biden's mental faculties, noting that he's "as sharp as he was 31 years ago" and assuring p...