Weigel identifies one reason tea-partiers overwhelmingly support attacking Libya:
There are individual Tea Party leaders, like Williams or Rand Paul, who wince at a military intervention undertaken like this. The Tea Party is libertarian in plenty of ways. But if it has one defining characteristic, it's that it's nationalist. If there's a way to remove Qaddafi decades after he aided the Lockerbie bombers, then that's more important than a debate over the deep thoughts of the founders.
If the Tea Party can support military action where there isn't even a smidgen of national interest involved, they are neocons in libertarian clothing. Just as one suspects they are Christianists in fiscal clothing. They are the hard right of the GOP.