Cate Blanchett possibly got more than she bargained for this week when she was caught up in a backlash over her appearance in a campaign calling for Australians to support a carbon price. Blanchett, a renowned and wealthy international actress, was dubbed 'Carbon Cate' and vociferously attacked by some media commentators for taking part in the 'Say Yes to a Price on Carbon' campaign, organised by 140 prominent Australians and community groups. Just how well does celebrity endorsement work?