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: 'They jumped ship to back Obama.That never would have happened if McCain had done the personally smart and politically sensible thing and picked Mitt Romney as his VP choice .', Argument/Subject 1: 'mccain', Argument/Subject 2: 'romney'
pick