Trump's Democratic opponent, Hillary Clinton, said she has not visited Louisiana yet because "the relief effort can't afford any distractions." That's a real concern with high-profile visits, even though they may draw attention to the disaster, said Larry Sabato, director of UVA’s Center for Politics. Presidents did not routinely visit disaster areas until they could easily fly there. "It's a logistical nightmare on top of the disaster itself," Sabato said, noting that visits require coordination with busy police and emergency personnel and sometimes s...