There are 'civil liberties' Libertarians, ones that are pro-free speech above all else. To appeal to the left we should try to emphasize matters such as being against war (except for the last resort) and for separation of church and state (at least the extent we can be). Sorry jfern, I can kinda see where you're goin with this, be you can't expect me to support a 'libertarian' that's against a free market.
Well, really it all comes down to who you would have voted in the 1933 election in Germany.
Godwin's law.
You lose.
Godwin's law doesn't say that bringing up Hitler makes you lose a conversation.
http://en.wikipedia.org/wiki/Godwin%27s_lawCorollaries and usage
There is a tradition in many Usenet newsgroups that once such a comparison is made, the thread is finished and whoever mentioned the Nazis has automatically "lost" whatever debate was in progress.