Who Will Shoot First?

In a story that will get me into trouble, but President Obama is going to visit Wisconsin and will be escorted by Governor Scott Walker.

Make no mistake, both Walker and Obama hate each other.  They are on polar opposites on the political scale and each will play off of each other in the recall of Walker and the presidential election featuring Obama.
Wisconsin just became a concealed carry state in which it's citizens can carry guns under their coats/shirts/clothes.
So, which canidate will shoot the other on Obama's visit? (just kidding, Secret Service)  While they might not do any shooting, they may certainly feel like it after listening to each other's speeches and comments.

(again, just kidding)