Is it okay for Obama to Ignore the Constitution?

Dear Leader Barack Hussein Obama thinks it's permissible to rewrite federal statutes, like immigration laws and ObamaCare's employer mandate and signup deadlines. Example: Regarding laws governing U.S. immigration policy, when Obama signed the executive amnesty order barring prosecution (and subsequent deportation) of something like 4 million illegal immigrants, he said "I just took an action to change the law." He was never concerned that his action was illegal. He just saw 4 million Democrat voters.

Obama's rationale for unilaterally changing the immigration law: the fact that Congress was hopelessly gridlocked on immigration issues and wouldn't pass laws he favored, the intolerable legal limbo that illegal aliens found themselves in, and that a crisis existed that demanded that he act, that he sign an executive order.  The fact that the aliens were (by current law) illegal never was a consideration for him. It was just crucially important that he immediately act unilaterally. So he did.