The question of McCain's citizenship was indeed brought up, at many of the forums I frequent, and then dropped immediately when the facts were exposed.
The same occurred with BHO too, except for a small group of Birthers who are simply too impatient to wait either until election time or Barry's allotted time as POTUS to run out.
Neither party wins National elections anymore. One party gets in power and Fails Epically, and the Moderate base votes for the other guy. Neither the Dems or the Republicans have actually won National elections since the Carter Administration, if not earlier, they merely loose the election to the other guy.
This has resulted in the Neoconservatives developing a definite predilection towards fabrications in an attempt to force the "other guy" to loose by swinging popular support their way. Combined with a lack of a charismatic and/or capable leader offered by the DNC, these fabrications helped the Republicans to first get Bush43 into office, and then keep that office four years later.
The GOP just doesn't realize that the Moderate Base doesn't buy the bullshit anymore, and IMHO, successes generated by an Epic Fail from the Democrats, largely due to the juvenile blocking tactics of the GOP in general (present company excluded Dr. Paul) in addition to certain failed progressive policies, will create the mentality that Bullshit actually worked for them. I fully expect the level of fabrications to rise after the next national election cycle, although the quality will of course remain the same. I.E. None.