Radio host Don Imus is lashing out at rival Rush Limbaugh "even though," the New York Post pointed out today, "Imus himself was off the air several times during the 1970s and '80s because of cocaine and alcohol addiction." "Rush is a fat, pill-popping loser and an undisciplined slob who was turning his maid into a drug pusher, and she's the one who's gonna go to prison, and - as soon as he gets caught - he starts whining," Imus said Monday on WFAN in New York. "He's going to rehab because he can't get any more pills, and...