That's what people said about John Kerry in the 2004 election. The reason I disagree about it backfiring, though it may (and with no disrespect to you, dirtboy) is because Murtha expects us to respect his "present" based on his "past" (as did Kerry). Therefore, it is all fair game.
Besides, if he is one of the people questioning others' ethics, then his should be open for scrutiny as well. I'll be interested to see where this goes (or doesn't).
I am persuaded by the point you made at 174.