From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'be president of', Sentence: 'On Tuesday , November 4 , 2008 at about 8pm Pacfic Time , the major news networks officially called the election for the President of the United States of America for Democratic Candidate Barack Obama .'
President

Given Relationship: 'elect of', Sentence: 'The United States has just elected Barack Obama as our next President .'
elected

Given Relationship: 'buy', Sentence: 'Xanax buy xanax without diet pills in US online .'

buy