Obama really has no low he won't venture into.
Desperation to stay off the issues is rampant.
CampaignUSA 2012: Obama Campaign Suggests Romney Either Liar or Felon, Much More! | The Nation
Just for the facts, Romney is a liar, and he has admittedly committed felonies, but he won't be convicted on the ones we know he committed.
We know he is a liar because he has taken both sides on many issues within hours, and whichever side he actually stands on, he lied about being on the other.
As for the felony he impersonated a police officer and owned an official police uniform his father got him. I am not sure if the second part of that is just a misdemeanor, but wearing the uniform and presenting yourself to people as a police officer is most certainly a felony, and it is very creepy considering rapists and murderers use this to get victims. I would imagine it is well beyond the statute of limitations, and he will not ever be charged with that, but it is still a felony committed on american soil, and one that he used his status to accomplish and to keep covered up. This shows an extreme lack of moral character, and shows us that when he has power he abuses it.
So the question is not whether he is one or the other, he is both.