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.
Q: Given Relationship: 'become', Sentence: 'Senator Obama , the son of a Kenyan father and white mother from Kansas , would become the first African American president , after a stunning rise to the pinnacle of US politics -- he was not even a US senator four years ago .'
A:
become