A federal judge has sentenced former Democratic fundraiser Norman Hsu to more than 24 years in prison for violating campaign finance laws. Hsu was sentenced Tuesday at a federal court in Manhattan. His donations became an embarrassment for Hillary Rodham Clinton's presidential campaign. His arrest led Clinton to return more than $800,000 to donors linked to Hsu. Prosecutors say Hsu obtained millions of dollars from investors by claiming clothing or high-technology ventures would pay returns of 14 and 20 percent. Instead, he spent the money on himself. Hsu's decade-long Ponzi scheme collapsed in September 2007. 