I will need to watch Lincoln again because I could only understand half of what was going on and being said due to the speed, manner of speech and unfamiliarity of political life during Lincoln's time. However it stands up as a first class period drama/history piece which is something we haven't seen too much of from the United States.
The film is based on Doris Kearns Goodwin's 'Team of Rivals" which is the book Obama said he'd choose to represent how he will be President. If you haven't been paying attention this is why the revolving door of GovCorp™ demands that industry insiders end up making the laws and law makers end up being industry insiders. It's a good strategy but I don't think it explains all the mysteries of Obama.
Sadly the movie ignores that a lot of the civil war was largely steered by the Rothschild banking bloodline, but the slave emancipation theme is still worthy of examination, if understood as a sub plot.