For your reading and learning enjoyment (remember, I am a teacher) I am linking to a few random "how to grassroots organize" websites, which of course are all pretty leftist, but I have no problem learning my opponent's tactics and subsequently using those tactics against them.
(I simply typed "how to grassroots organize" into a search engine and these were four of the kajillions of results. Feel free to peruse at your leisure. Disclaimer: I do not know who the people are who put these sites up, I don't know what they are about, so therefore I do not endorse anything they say. I just thought they had some good tips on organizing. Whew.)
Debating Tip for the Day: when debating a liberal, be sure to ask them a lot of questions. I, and other conservatives I know, always end up underneath a barrage of questions and we never get to test our opponent's depth and breadth of knowledge if we are always defending our own. So, make sure to ask open ended questions...
"How does ... work?"
"How will ... get funded?"
"Are there any alternatives to ... ?"
"What are some examples of when ... was successful?"
"Do you have some sources so I can verify your ... ?"
And so on and so forth. Don't let them corner you without them ever having to pony up some explanations of their own. Believe me, this works. They usually always fold under this kind of pressure, and if they don't, then you can actually have a nice conversation or debate, especially if you've got your facts and supporting arguments in order.