Wakeforest22890
Snowpom
It may suggest problems in the system. It may also suggest preferences that women have. Personally, I could not imagine a worse existence than being a politician. Men and women are different and it could be that part of those differences would account for the lower proportion of women in politics. It is a quite ugly business. My guess would be a bit of both.
I think if it were 53-47 in the senate your argument could hold more water of it being "a bit" of both. It's 79-21. That's not merely a slight difference in proportion of the two.