The problem is radical liberalism hides in the shadows of classical liberalism in order to change the definition of what people think is radical into what the radicals wish to be mainstream. They are very successful at this because the opposition by default is always reactionary. Accordingly it is a day late and a dollar short.
Despite the fact, I don't agree with liberalism for the most part , I don't want to see radical liberalism become dominant over classic liberalism. This being said, I will fight for a classic liberal any day over a radical liberal.
@Haroush: In US politics, radicals have already dominated classical liberals. What classic liberals are left are either independent or republican. Senator Lieberman was the last of the classical, little "l" liberals in the democrat party. Of course if you ask a modern die hard democrat if they are classical - they will tell you they are.