Exercising his right at a BHO rally?
Usually there is screening, metal detectors, etc,... If there was none at said rally, than he knew he was going to be "pushing the envelope".
Everybody knows security is ratcheted up at a POTUS whatever, and yes within his right to carry openly, what did he expect?
The Secret Service or LEO's were just going to let him "walk around a POTUS rally?"
It takes big cohonas to do what he did, he probably knew what the outcome would be, and I commend his standing up for his right, however guns are not going to allowed at a POTUS anythng, unless carried by LEO"s.
Think about the 2nd Amend. March. Show up openly carrying?
D.C. and Most states do not allow carrying of anything on Fed. property. Maybe a pocket knife....