When presidential hopefuls attack (Updated)

I wondered the other day whether the mainstream press would be willing to say that Barack Obama attacks the likely Republican presidential nominee. Both have more-or-less pledged a civil campaign, and both have made relatively frequent negative mention of the policy ideas of the other.

Obama attacks: Two Google News hits, including one by the St. Louis Post-Dispatch (what were they thinking?).

McCain attacks: One hundred sixty Google News hits, including The New York Times, the Associated Press, The Washington Post and Reuters.

Is it possible that McCain is simply doing more attacking than Obama? Yes, it's possible--but to the degree indicated by the news reports?

Update:

With the New Politics one does not attack. One focuses on.

Obama focuses on McCain during Florida stop

[...]

The Illinois senator also took several shots at McCain, criticizing the influence of lobbyists in his campaign and calling him a new version of President George W. Bush.
(Reuters)

It wouldn't really be right to call that an attack, would it?