Hillary Clinton returned to Iowa — a crucial early primary-season prize — on Sunday, renewing speculation about the possibility that she plans to make a second run for president. The former secretary of State's husband, former president Bill Clinton, joined her at an annual steak fry fundraiser held by Sen. Tom Harkin, the state's powerful Democratic senator, who is retiring after four decades in Congress. "I'm back!" Hillary told supporters. "It's true. I am thinking about it."