(I'm guessing that it was the Public Garden memorial tree controversy that the Herald photographer was out covering.)

First Romney gets miffed that Arnold doesn't pay his respects on his turf, and then he goes and offends Menino on his turf (in an even more literal sense.)

These are rookie mistakes that career politicians learn to avoid early. The difference between Romney and Menino is that when Menino (who is not a rookie in the game) offends someone, it's because he intends to.