Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Q: Sentence: 'The UWI lecturer also says that Caribbean leaders should not hesitate to approach the new president of the United States , Barack Obama , if they are to benefit from his election to the high office .', Argument/Subject 1: 'barack obama', Argument/Subject 2: 'unite state'
A: 
be president of