Jefferson Davis: An American President (2008)
I found no 'trailer'. This 3-disk DVD I checked-out of my local library.
As a lifelong northerner, I never understood how southerners (continue to) say the Civil War was "an invasion by the north". This sympathetic documentary gives somewhat of an explanation, as well as his full biographic history.
. . .btw, there is a claim in the film that the pope sent a crown-of-thorns to JD when he was incarcerated after the war -- not true (pope did send a picture with a handwritten in latin note).