Rudy Giuliani may have made a great mistake by not campaigning in New Hampshire, Nevada, Iowa and South Carolina. But between Rudy Giuliani (and, for that matter, Mitt Romney) on the one hand and John McCain on the other, there is little question as to who more embodies mainstream conservative and Republican principles. But Giuliani is not merely more of a conservative than John McCain. In fact, if it is Ronald Reagan that Republicans want, Giuliani is extraordinarily close to that venerated man. Ronald Reagan stood for two great beliefs: that big government is a big problem for a free...