This headline is revealing

If a candidate attacks another candidate for being too negative, isn’t that….negative?

Hillary Clinton and Barack Obama haven’t crossed paths yet during their weekend barnstorming across Pennsylvania, but they have invoked each other’s names at virtually every whistle-stop during the final blitz before Tuesday’s primary.

Each candidate says the other is unfit to lead the country.

Clinton has attacked Obama for his recent comments about some small-town Americans, his heath care plan and his relative Washington inexperience. Obama has countered by taking aim at Clinton over her acceptance of money from political action committees, her health care plan and her Washington experience.

But the most oft-repeated charge — the one mentioned at virtually every stop — is negative campaigning.

That that is all they have in their arsenal right now, says a lot.