Editor's note: Anya Kamenetz is a senior writer at Fast Company magazine and the author of Generation Debt, DIY U, and the free book The Edupunks' Guide.

(CNN) -- This week President Obama did a swing through some college campuses talking about student loan debt. The immediate issue is the 3.4% interest rate on federal student loans. It's set to double July 1 unless Congress acts. Keeping the rate low in this still weak economy is, as the president said, a no-brainer. Even his opponent Mitt Romney has endorsed it. But the larger problem -- mounting college costs and a cumulative $1 trillion in student loan debt — remains untouched.