They can sue GM, the IRS, Obama, Holder, et al. GM will probably be the one that pays. Meaning the government will shuffle some of all of our money into GM to pay for this.
The GM and Chrysler executives will have emails leading back to government sources. I think that both Holder and Obama are sitting there and looking at a massive drag on the administration if we get to the dealership episode. This is likely the reason why no special prosecutor will dare be selected.
On the other side of this...IRS will suffer such a significant punishment by November of 2014...the only way we can fix this is by going to a Republican senate and house....to push flat tax. Lobbyists by the thousands will try to stop it though.