Steven Den Beste writes about recent nearly-comical protests:

Ostensibly the purpose is to prevent war. But the only way you can determine that is by the fact that they call it "antiwar protesting". The only way they could conceivably prevent war is by delivering a message which would convince the majority of American voters that war is wrong. Yet they seem to package their message in terms which are virtually guaranteed to alienate and offend the majority of voters, guaranteeing that they will stay in the political fringe and never attain the political critical mass necessary to actually have any political effect.

Replace "war" with "big government", and you have in a nutshell my reason for letting my membership in the Libertarian Party lapse.