U.S. Senate challenger Todd Akin's support in Missouri has plummeted since his remarks a week ago about "legitimate rape" and pregnancy, putting him 9 points behind Sen. Claire McCaskill in a race he was previously winning, according to a new Post-Dispatch/News 4 poll.More than half of Missouri voters now view the Republican congressman unfavorably, the poll indicates, and fewer than one in five view him favorably.Akin's fall is especially dramatic among women. They were about evenly split between Akin and McCaskill in a similar poll at the end of July, but women now oppose him by almost 20 percentage points....