Only 25% of Americans have a college degree. When you figure that 77% of Americans are white, and take 75% of them (without a degree)......that's about 210,757,500 people of the 323 million total - or 65% of the population.
Data from the US Dept of Education shows approximately 72% of bachelors degrees are held by white Americans, and 56% of those are held by white females. Only 9-10% of black Americans have a bachelor's degree.
Anyway, I got a bit lost in my own dissertation, but any pollster is more likely to encounter a white male without a college degree than any other demographic, right out of the gate.
It depends on where I am.