Perhaps the answer to the question about what it really means to be intelligence is to judge a book by its cover. It turns out that Beauty and Brains Often Come Together. So, except perhaps at the limit, when you meet someone who appears smart, but is unattractive, you should have second thoughts about their judgement. If they are academics or their politics are left-win, even more so!
Since people who have post-graduate degrees are politically more left-wing than people who have only bachelors degrees and since the more education one has the less likely one is to have kids (see the previous link) then are the genetic variations that code for a predisposition to left-liberalism being selected against? My guess is that high IQ people who do not go on to grad school are politically to the right of high IQ people who do. Well, the latter are probably having fewer kids than the smarties who do not go to grad school. So are the future generations of high IQ people going to be more right-wing than they are now?