Given the task definition and input, reply with output. 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.

Sentence: 'On Feb 10 , Barack H. Obama , the Democratic Senator from Illinois stood on the steps of the old Illinois Capitol in Springfield and gave a 21 min landmark discourse that culminated in the much anticipated official declaration of his run for US president in 2008 .', Argument/Subject 1: 'obama', Argument/Subject 2: 'illinoi'
be senator from