What do you think about this article?

Question

http://www.salon.com/opinion/feature/2007/10/25/taxes/index.html?source=email

The middle class can't afford to give to politicians. duh! And they are shut out of government. Will middle class Americans please rise and let your voices be heard? Please. If not for yourself, do it for your children and generations to come. Stand for something good, won't you?

Answer 1

I need to know what is meant by 'middle class"