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: 'Now George W. Bush is the President of the United States .'
President

Given Relationship: 'be president of', Sentence: 'At noon EST , Barack H. Obama became the 44th president of the United States of America .'
president

Given Relationship: 'become', Sentence: 'When we look at this lovely ceramic planter , we think of the wisdom and grace of the American people as they helped Barack Obama become the first African American president of the United States .'

become