You' re for Randall, and not your father, for vice president.
"be for""支持,贊同,站在哪一邊"
eg: We have got two different opinions. Which arguement are you for?你支持哪種意見?
I' m for more environmental protection because I don' t think the goverment is doing enough.我很支持環保,因為我覺得政府在這方面做得還不夠.