Another partisan fight over federal student loan interest rates looms on the House floor today as Republicans try to shift the program to a market-based approach. The GOP bill was based on a proposal in Obama’s fiscal 2014 budget request to peg interest rates to 10-year Treasuries. The key distinction is the bill would allow rates to fluctuate with the market and be reset each year. Democrats want to eliminate some uncertainty by setting rates on the Treasury’s actual cost of borrowing and then fixing them for the life of the loan. In its veto threat, the White House said the bill would burden students from lower-income families with potentially onerous rate increases. Critics have also noted the legislation lacks Obama’s proposal to extend repayment options to borrowers who have already left school. Even if the bill makes it out of the House, its prospects are grim in the Democratic Senate, which could adopt a plan (S 953) to simply extend the current 3.4-percent rate or to address rates as part of a reauthorization the Higher Education Act.