By Howard Kurtz Washington Post Staff Writer Thursday, September 11, 2008; 10:09 AM The media are getting mad. Whether it's the latest back-and-forth over attack ads, the silly lipstick flap or the continuing debate over Sarah and sexism, you can just feel the tension level rising several notches. Maybe it's a sense that this is crunch time, that the election is on the line, that the press is being manipulated (not that there's anything new about that). News outlets are increasingly challenging false or questionable claims by the McCain campaign, whether it's the ad accusing Obama of supporting sex-ed for...