As the sitting de facto POTUS, whether originally eligible or not, he cannot be removed except by Impeachment in the House and Conviction in the Senate. Of course, he could resign. Neither is likely.
It is this unpleasant set of facts that is causing about 25% of Americans massive "Cognitive Dissonance," that can only get worse in the remaining years of the prepostor's term.
BTW, Team Obama's attorneys are NOT working pro bono. No one will ever know how much this has cost George Soros, but the officially admitted number is now verging on $1.5 Million+.
At this time the actions for Writs of Quo Warranto which, on appeal to the SCOTUS by either side, might definitively establish what a "Natural Born Citizen" is, once and for all, are stalled in the federal district court of Washingon, DC, which is the only court in the land Constitutionally empowered to hear the case.
No matter what they, or the SCOTUS decide, the actual removal can only be accomplished by Congress through, again, impeachment and conviction.
The supreme irony is that Obama is now protected by the very Constitution he deconstructed.
A very wise man once told me, “Its not a perfect world.”
Oh, that it were. But, I think that we are only left with elections as a cure. 2010 can put them on notice and put in place a Congress that will stymie the Executive Branch and then in 2012 we can be rid of this pestilence.