In California and other states, [[Barack Obama]] was leading in the polls to Hillary Clinton. In California's primary, Obama lost by a landslide 10 percentage points after a late survey showed him ahead by 13 points. The bradley effect was invoked. <ref>[http://www.realclearpolitics.com/articles/2008/02/the_bradley_effect.html The Bradley Effect? RealClearPolitics.com, February 11, 2008</ref>
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In California and other states, [[Barack Obama]] was leading in the polls to Hillary Clinton. In California's primary, Obama lost by a landslide 10 percentage points after a late survey showed him ahead by 13 points. The bradley effect was invoked. <ref>[http://www.realclearpolitics.com/articles/2008/02/the_bradley_effect.html The Bradley Effect?] RealClearPolitics.com, February 11, 2008</ref>