In my defence, I would suggest that if the Bush-Cheney brigade had realised how bad the Congressional Elections were going to turn out and if they had the ruthless streak that I can envision on occasion, I think they would have done it.
My view is that they thought they could win the elections anyway, so it wasn't worth taking the risk that an Iran bombing would be seen as cynical political manoeuvering. I always thought they were going to lose the elections, so I felt they needed to gamble to get things on track.