Should Honesty be a Prime Quality in Elections?

There is a nasty campaign going on in Pennsylvania for the governorship. I know little about the combatants or their positions. One thing, however, is quite glaring. The challenger, Wolf, is denigrating the incumbent, Corbett, for decreasing funding for education by one billion dollars.
We all know that education is a sacred field where no one can casually step. All education is valuable. Money for all education must be good. But, fortunately, the questions of the real value of education and its financing will go untouched; Corbett's budget is one billion dollars less than it was when he started. Therefor he is guilty--of something.
Except for one thing. Corbett did not remove money from the Pennsylvania educational system. The Federal Government did. When Corbett came to office the feds had, strangely through the stimulus package, given one billion dollars for Pennsylvania education. Gradually that went away and was not renewed by the federal grants.
Now one could argue that the federal government could find a better place for stimulus money, that infrastructure might be a better target than the teachers' union, etc.. But, regardless, Corbett had nothing to do with either the money's appearance  or its disappearance. More importantly, Wolf knows that.