I would contend, that a very large majority of Congress had no clue that Barry was born the subject of a foreign crown. Heck, most of them have no clue as to the difference between a "citizen" and a "natural born citizen" as evidenced by their reply's to inquires about Barry's eligibility.
As for the others, I believe that this all boils down to his race. There was not a single person in Congress (or in the "big" media/radio) that was going to go out on a limb to try and expose the first "black" POTUS...even though he's more white and arabic than black. He simply wasn't going to be denied, especially in light of his high popularity ratings both before and right after the election.
Of course, the tide may eventually turn. Think in terms of the Nixon timeline.
OMG! Have I taught you nothing?
parsy, who isn’t feeling like Teacher of the Year material right now