well, these are all correllation arguments though, just like heritability is. Its not possible to claim that political party isn't inherited (at some level) in a true genetic sense; that hypothesis isn't refutable on the basis of 'it also corresponds to these things'. Now, i'm not going to argue that there's a neuron in our brain thats either republican or democrat, but i would argue that its likely there are ideological premises that push us towards one party or another, and these are heritable in a biological sense. Just think of some of the very axiomatic assumptions made by the ideology of each party. Those are probably tied (vaguely) directly to brain chemistry and genes.