WTF??? Why the hell would they want to invest in a government controlled program? Everyone knows how efficient the gubmint is at runnin' things! (wink, wink)
What you'll see emerge between now and the MI primary is a narrative that suggests its Romney's fault GM *had* to go to the government because Romney hates his homestate or something.
As with the ginned-up contraceptive controversy, it isn't based on logic, facts or even principles. It's about pressing on people's emotions to get them away from Mittens.
The commies want Santorum for an opponent because they believe--with reasonable measure--he'll get off message and veer down Christian-social conservative issues that will play badly in the general election. Get Santorum on video railing against the evils of anal sex or some such non-presidential bullshit and he'll set himself up as an out-of-touch extremist. Sin is Santorum's shiny object and it will hurt him in his bid to hold America's highest non-ecclesiastical office.
Of course Romney is no prize as he is the guy that lost ot the guy that lost to Obama last time around.