"Free Trade" and Presidential Politics

Ronald Reagan, both Presidents Bush, Bill Clinton and Barack Obama have all supported massive trade agreements from NAFTA to CAFTA to the Trans Pacific Partnership. Economists disagree about who wins and who loses in these complex, economic agreements, which are negotiated in secret, with lobbyists for powerful interest groups making sure they get in on the action. The TPP been signed by the US and 11 Asian countries, but it's still waiting for an up or down vote in Congress. Meantime, it's become a hot-button issue in both the Democratic and Republican presidential campaigns.