The Nominees:

• Citizenfour — Laura Poitras, Mathilde Bonnefor, Dirk Wilutzky
• Finding Vivian Maier — John Maloof, Charlie Siskel
• Last Days in Vietnam — Rory Kennedy, Keven McAlester
• The Salt of the Earth — Wim Wenders, Juliano Ribeiro Salgado, David Rosier
• Virunga — Orlando von Einsiedel, Joanna Natasegara

Will Win: Citizenfour

Could Win: Virunga

Should Win: Citizenfour

Citizenfour should win this one. It is a great film (read my review of Citizenfour here). Virunga and Last Days in Vietnam show some competition, but the inside access to Edward Snowden in Citizenfour is too good for the Academy to pass up, in my opinion.