Alaska Gov. Sarah Palin’s speech during Wednesday night’s Republican National Convention bested Democratic speeches from Hillary Clinton, Joe Biden and, in some cases, Barack Obama in preliminary ratings. Speaking last night, along with former New York City Mayor Rudolph Giuliani, Gov. Palin took in a 5.4 rating/8 share on NBC, according to preliminary overnight household data from Nielsen Media Research, measuring 55 markets across the United States. In terms of this year’s conventions, the preliminary rating for NBC’s coverage last night is higher than any other night of the convention on the broadcast networks, including Sen. Obama’s nomination acceptance speech...