Much of Obama's support comes form people who expect the federal government (that would be you and me) to pay for their food, housing, medical care, and now, cell phones.
These same supporters think it is just fine to deface Romney campaign signs and key cars with Romney bumper stickers.
I have yet to hear of Romney supporters defacing the property of Obama supporters.
Now why is that, so you suppose?
(because conservatives allow others to have different opinions without lashing out)