Newt Gingrich (about whom we've had a lot to say but who was a serious Presidential contender in 2012) thinks that

Obama’s move to stop deportations is a step toward dictatorship.

“Our entire constitutional structure is at stake,” Gingrich, who ran for president in 2012, tweeted. “This new Obama power grab is the greatest threat to freedom since King George third.”

Gingrich wants to block Obama's executive actions, by Susan Ferrechio, Washington Examiner, December 3, 2014

So why not revolution/ impeachment?