http://change.gov/agenda/education/ says: "Create the American Opportunity Tax Credit: Obama and Biden will make college affordable for all Americans by creating a new American Opportunity Tax Credit. This universal and fully refundable credit will ensure that the first $4,000 of a college education is completely free for most Americans, and will cover two-thirds the cost of tuition at the average public college or university and make community college tuition completely free for most students. Recipients of the credit will be required to conduct 100 hours of community service."

So is actually required, or do you just miss out on $4k if you don't do it? If the latter, that actually doesn't sound completely unreasonable. If the former, I don't see this passing muster with Congress let alone the Supreme Court.

There's nothing about a tax credit for the high school version, but plenty of high schools already require service hours to graduate and I haven't heard of the legality of that being challenged. I do disagree with the idea of the federal government micromanaging public schools in general, but that's a trend that doesn't seem to be going away anytime soon, given that even Republicans favor it.