The chance of a party with 1% support getting 300 or more seats out of 600 is roughly on the order of 0.04^300.* This number is so small that you're probably b

The chance of a party with 1% support getting 300 or more seats out of 600 is roughly on the order of 0.04^300.* This number is so small that you're probably better off worrying about a literal biological virus that turns people into fascists. *The factor of 4 comes from the rate of growth of the central binomial coefficients.