Immigration reform, including the regularization of the nation’s 11 million-plus illegal immigrants, appeals to a large slice of the conservative movement — if it is accompanied by genuine border security, specifically a very long, very strong border fence along the U.S.-Mexico border.

Sen. Mary Landrieu, D-LA, calls the proposal for a border fence “dumb,” but she impeached her own credibility by adding to that condemnation a declaration that South Dakota shared a border with Canada.