Besides attacking each other over Medicare, school lunches and the Iraq war, Missouri Democratic Sen. Claire McCaskill and GOP challenger Rep. Todd Akin spent their first debate Friday blaming each other for the gridlock in Congress that has stalled crucial pieces of legislation over the last two years. And after initially mentioning the damaging comments on rape and pregnancy that have dogged her Republican opponent over the last month, Mrs. McCaskill didn’t bring them up again. Instead, both candidates talked mainly about their sharp policy differences, with Mr. Akin trying to paint Mrs. McCaskill as an Obama liberal while she...