I think Duncan Hunter is a great choice...who has absolutely no chance whatsoever of winning the nomination. He's conservative, understands our illegal immigration problem better than most and comes from southern California.
Since SoCal has so many votes, he might make a legitimate choice for VP, but he has no chance at all of getting the nomination, not nearly enough name recognition outside of southern CA. With California considering a ballot initiative that would split our electoral votes in proportion to statewide voting, having him might help carry Orange, San Diego counties and all the other counties surrounding LA. If that happens and the initiative passes, Hunter as veep might be a wild card that could tip the election in a meaningful way.