I think this "do-over" of the oath of office was a big mistake. I think it's going to embolden rather than silence the right-wing detractors and kooks.
Just this morning I saw people saying that the orders President Obama signed shortly after he was sworn in the first time could possibly be challenged.
And even if those challenges aren't successful you know there will be an element who will protest from now on that Obama really doesn't have any power as president since they fucked it up the first time.
Also, Bill Sammon was on Fox News this morning complaining that the second swearing-in wasn't done fully out in the open with cameras rolling and the full press corps present.
I think because of that and since apparently no bible was used this second time weirdos everywhere will find reason to say that President Obama has never been correctly sworn in.
I can even imagine some crackpot claiming that it wasn't really Obama and Roberts heard in the audio recording of the event.
But, I will say this is no different than having to deal with these same kind of people claiming 9/11 was an inside job.