Hello! I am also looking to apply as a poli sci/business major at the UC’s! Good luck to the both of us 
I think UCI, SDSU, SJSU, SFSU are all matches, however UCLA, UCB, and UCSD could be reaches! Nonetheless, I think you have a great shot. Chance me back?
http://talk.collegeconfidential.com/what-my-chances/1823392-chances-at-ucb-ucla-usc.html#latest