Are Studios Required to Promote Stars for Awards?

Do studios have to campaign for Oscars for certain actors? I'm just wondering how much of Natalie Portman's or Colin Firth's Oscar buzz may come from the fine print in a...

Source: http://feeds.eonline.com/~r/eonline/answer/~3/dus6qSbYa-0/b223565_are_studios_required_promote_stars.html

Rachel Bilson Rachel Blanchard Rachel Hunter Rachel McAdams Rachel Nichols