Negative attack is one way to diminish your rivals, but it’s not building a vision …

“You have to campaign to govern, not just to win,” [Gov. Mitch] Daniels told Matthew Tully of The Indianapolis Star. “Spend the precious time and dollars explaining what’s at stake and a constructive program to make life better. And as I say, look at everything through the lens of folks who have yet to achieve.”
According to Mr. Tully, “after a pause, Daniels added with disappointment, ‘Romney doesn’t talk that way.’

From After Endorsing, Indiana Governor Criticizes Romney — NY Times