President Obama's attack, during the final debate, on Mitt Romney's critique of the auto industry bailout was 100% false, i.e., a bald-faced lie.

When Romney said, during the debate, that in 2008 he favored a managed bankruptcy for Detroit's auto makers, with federal guarantees for post-bankruptcy financing, Obama directly claimed this was a falsehood, repeatedly saying, "Check the record." 

Here's the record, via Mitt Romney's New York Times op-ed from November 18, 2008.  Allow me to quote one representative sentence from that op-ed: