Some back of the envelope calculations, feel free to suggest more reliable numbers.

There are roughly 25,000 men named Earnest in the US right now.

There are around 300 million Americans right now, around half of which are male and around 30 million of which are impotent.

So we can deduce that roughly (and I do stress roughly) 10% of Americans, 20% of American men are impotent.

This gives us 5,000 (±1,000 – let’s say) Americans who truly understand the impotence of being Earnest!

(that was a lot of googling for a lame joke, I know)