One argument libertarians offer against government funding for education is that it facilitates thought control, since funding education means defining education.  This problem is particularly accute if funding comes in the form of public schools; it exists but is more easily avoided if funding comes as education vouchers.

Advocates of public schools view this concern as wild exaggeration, but I wonder what they think about a recent decision by the Texas School Board:

Finally, the board considered an amendment to require students to evaluate the contributions of significant Americans. The names proposed included Thurgood Marshall, Billy Graham, Newt Gingrich, William F. Buckley Jr., Hillary Rodham Clinton and Edward Kennedy. All passed muster except Kennedy, who was voted down.

More broadly, as this article explains, Christian Conservatives have become almost a majority of the Texas Board, and they want the public school curriculum to teach that the founding fathers were Christian and intended for the country to be the same.

The power to fund is the power to control.