Was it just coincidence or did President Clinton sound a lot like Lou Gehrig the weekend before last during his Arkansas trip? In his famous valedictory speech to Yankee fans after contracting the disease that would bring him down in his prime, Gehrig, choking back tears, called himself "the luckiest man on the fact of the earth." Clinton, speaking to supporters at a fund-raiser in Little Rock, offered the gender-scrubbed nineties version: "I've been the luckiest person in the world," he said. "The American people have continued to support me in the face of unprecedented attacks." Gehrig, of course, was eschewing self-pity.