October 10, 2008 BY MARY MITCHELL Sun-Times Columnist When you step on a pig's tail, it squeals. Rush Limbaugh is a squealer. » Click to enlarge image Sun-Times columnist Mary Mitchell RELATED STORIES Transcript: Read Rush Limbaugh's rant And why is he squealing? Because John McCain and Sarah Palin are losing ground in a contest that they thought was theirs. And they are losing it to a black man. Of course, Limbaugh won't say that. Instead, on Thursday he spent his time berating me for saying Palin needs to apologize for inciting crowds that hurled racial epithets at black members...