Presidential hopeful Mitt Romney's struggles in Michigan are fueling speculation that Republicans might have to resort to a doomsday scenario and launch a frantic search for a 2012 savior at their nominating convention in late August. Rare in the modern age of U.S. politics, a "brokered convention" could result in Republicans ditching their current crop of candidates and turning to someone else who they feel would have a better chance of defeating Democratic President Barack Obama in the November 6 election. How did Republicans get to this point? Romney's failure to get conservatives fully behind him and put down yet...