Republican Mitt Romney would tackle tough debt and deficit problems if elected on November 6 in ways that potential vice presidential running mate, Senator Rob Portman, said on Tuesday. could leave him at risk of being a one-term president, a "This is something I have never said publicly, I've told my wife this, but I think he'd be willing to risk being a one-term president in order to make the tough decisions that are going to be required," Portman told the Reuters Washington Summit.