Neal McLuskey from CATO is up and he mostly agrees with Checker. (This is more surprising than you might think. We don't generally agree on much.) But he has two additional points:
1. Over time, programs like Head Start get captured by the people who are employed by them.
2. The political reality is that it's very hard to keep programs targeted on the poor, and not to expand them to the middle class. Consider federalaid for college students, for example.