A behind the scenes argument has broken out among Democrats and immigration advocates in the wake of public discussion of a so-called “Plan B” on immigration, in which advocates would press the White House to legalize millions of undocumented immigrants via executive authority if Congress fails to act. Some have pushed the “Plan B” idea in the media to increase pressure on Republicans to support legislative reform, by getting them to fear Obama would legalize the 11 million himself if they don’t do it on their own terms. But others — including, sources say, the White House — think floating...
