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: 'Much like Hillary gaining experience over her eight years alongside the president of the United States of America , Bayh has surely gained invaluable experience over the course of his lifetime alongside his father .', Argument/Subject 1: 'hillary', Argument/Subject 2: 'america'
A: 
be president of