I'd be happy to take what the ad says figuratively — if the ad, itself, was constructed to allow me to do so. However, it is constructed in the literal:
It says: "The Iraqis aren’t insurgents. They’re Iraqi patriates..." Literally, the people who are killing our soldiers, kidnapping civilians of many countries, putting Iraqi civilians in harm's way, and making it difficult to rebuild their country after Saddam Hussein's 30-year predation are heros in the minds of the Democrats who wrote and paid for this ad.
The ad says: "We have Marines and soldiers being killed by the dozens...How many have to be killed before the Bush Bunch is satisfied?" Literally, the ad accuses President Bush and his Cabinet of WANTING our Marines and soldiers to die. In this context, the ad then says:
"And then there’s Rumsfeld who said of Iraq 'We have our good days and our bad days.' We should put this S.O.B. up against a wall and say, 'This is one of our bad days,' and pull the trigger."
The whole construct of the ad is literal, so the author of the ad leaves no room to take the Rumsfeld comment in any way other than literally. It sets up a reason why Rumsfeld should be executed (deliberately sending our Marines and soldiers to their deaths for no good reason in Iraq) and then calls for his execution.