Brad DeLong thinks that Bastiat would be a modern liberal (I had said the other day that he likely would be a libertarian but that Smith, Jefferson, Locke, Paine, etc. were classical liberals that would very plausibly be left-liberals today).
I think he makes a good case. I've discussed many of the passages he presents to make the claim here, and I think they are important for libertarian fans of Bastiat especially to be aware of. And anyone that's followed the blog for a few years know that I think most modern invocations of the broken window are God-awful and that Bastiat's understanding of general equilibrium is far more sophisticated and closer to people like me or Krugman who make important distinctions between stocks and flows (wealth and income) in arbitrating the effects of, for example, a disaster.
I would only say this in my defense (because I still think he would be more of a libertarian, simply due to the center of gravity of his commentary): he would certainly be more of a libertarian in the vein of Hayek of the Constitution of Liberty or Law, Legislation, and Liberty than a libertarian like Bob Murphy (for example).