The proposal that’s being bandied about — offering up to 5 million undocumented parents of U.S. citizens and others the same two-year renewable reprieves from deportation plus work permits that Obama already ordered for undocumented residents who arrived as children....would be constitutionally dubious, politically explosive and flatly contradictory to his own recently expressed views.

It would also bring many hard-working people out of the shadows, make generations of Latinos into Democrats and secure a place in history for its author.

And it might be impossible to stop.