Technique: Be sure to communicate what "everyone knows". Express these things (that, of course, everyone does not know but that you would like them to know and believe everyone knows). They will think, "If this is common knowledge, then it must be true and therefore, I must structure my thinking on this issue around these "facts". Even if they don't believe that what you say is actually "common knowledge", their thought structure will still be focused on this issue, thus, it helps set the agenda and frame the debate. 

One Liner: "Of course, everyone knows that (insert your opinion here) is so"