If you want to discover how a perfectly healthy pink state turns into a lasting blue one, look no further than Illinois.For years, Republicans often won statewide and federal elective offices. But thanks to a bungling party "leadership" way out of touch with its constituency, Tuesday's primary election to select a GOP nominee for governor presents voters with indecision, disappointment or disgust. Among the candidates, "I don't know" has made a strong showing.We columnists have raked this field of candidates to the point of tedium, but why not? Why should Republicans be forced to choose among marginal, inexperienced, unqualified or...