You say that as if 10k is too small a sample size to extrapolate accurately with, but actually that's a huge sample size that if done properly would be extremely accurate. You don't need to poll anywhere near 10k people to accurately predict all Americans views.

You can sample less than 2000 people and get 99% accuracy with a 3% margin of error for a population of 325 million. Increasing the sample size to 10k simply reduces the margin of error to 1.29%, hardly worth the extra sampling of 8k people.