It's tricky talking about the "Tea Party" since anybody can lay claim to the name. While it may have originally started with libertarians, they tried to make it "inclusive", which bit them in the ass when a lot of conservatives decided they wanted in on the action, changing the message.
While I have some sympathy for libertarians pissed at the co-option, at this point I assume most "Tea Party" labels imply "conservatives pretending to care about the Constitution now that Bush is out of office".
Tear apart the parties into 3-5 factions!
Our archaic plurality voting system means it'll never really happen, alas. The closest that will ever happen is one of the big-two will die outright, and then be replaced either by another party or by the second big one splitting in half.