Reform push casts cloud over booming Sallie Mae:
Shares of Sallie Mae, one of Hamilton County’s biggest employers, have fallen more than 25 percent over the past year as investors fret that Congress will overhaul the student-loan industry, halving interest rates and bringing the company’s boom times to an end. Momentum for an industry overhaul has been building since Democrats gained control of Congress in November. Concerns peaked in February when President Bush submitted a budget proposal that included cuts in industry subsidies. Changes under consideration could whack…