Specifically, Tom Harkin is proposing a an amendment to the finance reform bill to limit ATM fees to 50¢.

I approve of the idea, particularly because it’s an in-your-face to the free market worshippers, but I’m not sure if it is a good idea for the finance reform bill.

As to the Al Franken book in question, it was the book Why Not Me?

Hw wrote his (fictitious) successful quest for the presidency using populist anger over ATM fees.