It isn't specifically about first cousins or you'd see a lot more birth defects in Arkansas and Missouri. It's about cultures that have been repeatedly marrying their first cousins for multiple generations until the level of co-sanguinuity reaches epic proportions.
It's really depressing how little choice we have. The Liberals/NDP are so deep into identity politics and socialism that I can't in good conscious vote for them while the conservatives talk a big game but they've fallen into the same pitfalls of political correctness. Maxine Bernier's party is the only one really worth voting for but I fear he won't be popular enough to upset the conservatives and it'll end up splitting the votes allowing Trudeau continue on as our dear leader.
[L]iberals used to be pretty epic under Chretien but he is the reason why the Liberals are the way it is and he basically laid the foundation for Identity Politics. Layton gave a really strong NDP but again same story...doesn't help with new generation of politician straight out of university indoctrination ala left disease.