That does not mean much. The Nazis initially received only about 10% of the popular vote in Germany - far less than 70% approval rates Bush is getting today - and that did not prevent them from grabbing political power and establishing a fascist dictatorship by purely political, if not exactly parliamnetary means.
What makes you think that he US is much different? Righ not, the "apple pie fascists" have no reason to feel threatened, but it is not too farfetched to imagine that the time-honored practices of blacklisting, lynching and assasination would return with vengence if the Greens and assoretd Lefdt wing elements started gaining real political power in the US.
Wojtek