Could Obama grant illegals amnesty by executive order?

And we all know how much he likes doing things by executive order.
Even so, and mindful of the fact that some O critics consider him capable of anything, I’m skeptical.

Several Senators have learned of a possible plan by the Obama Administration that would provide a mass Amnesty for the nation’s 11-18 million illegal aliens. Led by Sen. Chuck Grassley (R-Iowa), eight Senators addressed a letter to the President asking for answers to questions about a plan that would allow DHS Secretary Janet Napolitano to provide an amnesty if they can’t secure enough votes for a bill in the Senate.
The letter that was sent to Pres. Obama earlier today asks the President for clarification on the use of deferred action or parole for illegal aliens. The executive actions are typically used in special cases and are evaluated on a case-by-case basis, but if 60 votes can’t be secured in the Senate to pass a mass Amnesty, the Administration may use the discretionary actions as an alternative.
via Hot Air » Hmmm: Senators worried about Obama granting amnesty via executive order?.

Senators Challenge Pres. Obama on Rumors of Amnesty
Immigration Executive OrderEXECUTIVE ORDER
Michelle Malkin » The threat of illegal alien amnesty