There are a ton, ...but off the top of my head... "Death of a President" comes to mind.
It was an excellent film, so prescient, ...almost clairvoyant if you will, ...especially in light of recent events.
And in no particular order...
Sicko
The Manchurian Candidate
Syriana
John Adams
The Constant Gardener
Good Night and Good Luck
Elizabeth
The Duchess
Vatel
An Inconvenient Truth