HOW FAR IS TOO FAR?http://www.washingtonpost.com/wp-dyn/content/article/2010/09/15/AR2010091502969.html[EJ Dionne] Castle's defeat at the hands of Christine O'Donnell, a perennial candidate who may be the least qualified Senate nominee anywhere in the country, does indeed mark the collapse of the Republican Party not only of Nelson Rockefeller and Tom Dewey but also of Bob Dole and Howard Baker.