You seem to take the view that both parties are equally bad. I think that's nonsense. You should be doing what you can to help the Republicans and hurt the Democrats. I can't stand it when the LP tells the public and conservatives that it rejects both parties equally. It's destructive and unserious in regard to politics, smacking of bloated ego.
An effective attack on Democrats would focus on how hypocritical they are in their claims of being liberal and progressive. With out changing the Libertarian philosophy in the slightest, with a good dictionary, with a slight modification of rhetoric, the Libertarians could present themselves as the only party that that is truly liberal and progressive in America today. Out lefting the left, and attacking the Democrats on their own turf, would more than adequately take care of the problems you envision, while continuing the attack on Republicans.