April 13, 2007, 6:00 a.m. Imus Stepped on a TripwireBut oh the lowbrow we love. By Mona Charen He supposedly earned about $10 million per year for such delightful entertainment as flinging racist epithets around. America does reward the lowbrow, doesn’t it? Don Imus’s show was heavily promoted here in Washington, D.C., where I was subjected to the ads because I listen to Laura Ingraham’s show on the same channel. One assumes that the excerpts chosen for advertising were among his greatest moments on the air. One featured Imus complaining about his inability to reach his producers on the...