The support for the allegation that John McCain has had an affair with a lobbyist is vanishingly small. Yet there are 1,201 entries on Google News for the strong ” ‘John McCain’ affair lobbyist.” On Google itself, that same string returns 1,010,000 hits.
That’s quite a lot.
So that seems an acceptable benchmark for a comparison as to whether a story’s been under reported. If you have another metric, feel free to shout it out in the comments.