Secretary of Education Arne Duncan walks a thin line on free speech on college campuses in an op-ed published Friday by the St. Louis Post-Dispatch.

"We must make real the First Amendment guarantee of free speech — which is vital to a life of ideas on college campuses — but there is no constitutional right to perpetuate hostile environments or to engage in threatening speech," Duncan writes.

That sentence may help to alleviate the speech concerns of both those who want unbridled, free speech and those who believe in "safe spaces" from people and ideas with which they disagree.

Both sides can't have their way completely, but Duncan makes it look as if he supports both. Ultimately, the secretary of education doesn't have to pick a side. He can let these instances play out and be resolved by each university's administrators.

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