As reported by PRNewser’s colleagues at WebNewser, two Burson-Marsteller execs will be delivering the keynote speech at the BlogWorld & New Media Expo 2010: Mark Penn, CEO of B-M and Penn Schoen Berland; and Karen Hughes, worldwide vice chairman for B-M (and former counselor to President George W. Bush). They will discuss the results of a recent study about the use of social media during the mid-term election races. The speech will take place Friday, October 15.