Venues ready, but many challenges remain for Rio Games

By Andrew Downie SAO PAULO (Reuters) - Brazil has long been known as a country that can throw a great party as long as the guests do not mind a location that still has the builders in it. With 100 days to go before the Olympic Games begin in Rio de Janeiro, the nation famous for doing things at the last minute faces a novel situation: The venues are ready, but the host does not appear to be. With the country's president fighting impeachment and the economy on track for its worst recession in mor