No. The law has a widget called "de facto officer doctrine" that deals with this sort of mistake. See some discusison in Ryder v. United States, 515 U.S. 177 (1995) for example.
The de facto officer doctrine confers validity upon acts performed by a person acting under the color of official title even though it is later discovered that the legality of that person's appointment or election to office is deficient. Norton v. Shelby County, 118 U.S. 425, 440 (1886). "The de facto doctrine springs from the fear of the chaos that would result from multiple and repetitious suits challenging every action taken by every official whose claim to office could be open to question, and seeks to protect the public by insuring the orderly functioning of the government despite technical defects in title to office." 63A Am. Jur. 2d, Public Officers and Employees S: 578, pp. 1080-1081 (1984)
Application of the de facto officer doctine was REJECTED in the Ryder case, but it's a cinch it would be applied if the fact of Obama's ineligibility ever became officially accepted.
Thanks for the clarification! Bummer.
So, undoing Obama will just have to be done the hard way, one item at a time.
no its not a cinch, his eligibility was challenged repeatedly...