Barack Obama and Hillary Clinton are not free-traders, McCain is

A new Cato Institute website has the voting records for congress over at least a decade on trade. Barack Obama and Hillary Clinton are solidly in what Cato calls the Interventionist camp (go here and plug in his name):

Clinton
Barrier Votes: 31% (9 votes out of 29 opposing trade barriers)
Subsidy Votes: 14% (1 votes out of 7 opposing trade subsidies)

Obama
Barrier Votes: 36% (4 votes out of 11 opposing trade barriers)
Subsidy Votes: 0% (0 votes out of 2 opposing trade subsidies)

Interventionists -- Members of this group consistently support government intervention at the expense of the free market—favoring both subsidies and trade barriers. They tend to oppose bills and amendments that would lower trade barriers, as well as those that would cut or eliminate trade and investment subsidies. Interventionists reject the judgment of Americans twice, first by denying them full liberty to spend their private dollars beyond our borders and then by seeking to divert public tax dollars for export promotion and government-to-government bailout packages

By contrast, McCain is classified as a free trader

Barrier Votes: 88% (35 votes out of 40 opposing trade barriers)
Subsidy Votes: 80% (8 votes out of 10 opposing trade subsidies)