By Doug Gray, Senior Contributing Reporter
RIO DE JANEIRO – With President Lula still riding the wave of unprecedented popularity as his second mandate slowly draws to a close, it is not unreasonable to wonder whether the source of much of that popularity – Brazil’s undeniably impressive economic growth over recent years – will continue beyond his successor’s "honeymoon" in early 2011. How clear front-runners Dilma Rousseff or José Serra handle the possibility of an economic slump that could loom in . . .