Elizabeth Warren may have gotten a boost from her speech at the Democratic National Convention if two new polls are any indication.  A "Springfield Republican" poll of 444 likely voters shows Brown with a six-point lead over Senator Scott Brown, with Warren getting 50-percent support.  Public Policy Polling shows Warren ahead by two percentage points, getting 48-percent support from likely voters.  An August poll by Public Policy showed Brown with a five-point lead over Warren.