Don't know about NC but the schools here (in my district) in Wisconsin send school bond issue/ referendum campaign literature home with the kiddoes after they brainwash the little beasts into thinking that Life As We Know It Will End if the school doesn't get another $15 million to spend on plasma TV's, etc.
They did that in Mecklenburg County last year; also had school district employees putting out the signs on county time. Plenty of laws broken; government shrugs.
The bond issue lost big, though!
Here in Union, they've obviously been lecturing the school kids about the bond vote, or passing out literature, because the students are writing identical letters to the local papers. I plan to vote against it on GP, even though I'm sure it will pass.