About 11% of Americans self-identify as libertarian. However:
“However, when self-identified libertarians were asked to match up “someone whose political views emphasize individual freedom by limiting the role of government” with libertarianism, only 57 percent of respondents were successful. This means that 43 percent of self-identified libertarians do not understand the basic definition of the term.
Of libertarian respondents, 41 percent said that the government had a role in regulating business to protect the public interest. Similarly, about 38 percent stated that government assistance to the poor “does more good than harm because people can’t get out of poverty until their basic needs are met.” For foreign policy, 43 percent of libertarians believe that the United States should be more active in world affairs, whereas the public is more skeptical, with only 35 percent believing the same proposition.
However, the anti-government streak flared up when the question turned to marijuana. A full 65 percent of libertarians are in support of legalizing marijuana, in comparison to only 54 percent of the public.”