Steady debate performance banishes gloom for U.S. Republican Jeb Bush

By Steve Holland, Emily Stephenson and Ginger Gibson MILWAUKEE (Reuters) - A steady performance by Jeb Bush in Tuesday's Republican debate has halted the sense of desperation around his U.S. presidential campaign and may buy him time to counter the rise of chief rival Marco Rubio. The fourth Republican debate in the search for a 2016 presidential nominee was characterized by a constant stream of attacks against front-runner Donald Trump and gaffe-free performances by Rubio of Florida and Ted Cru