On Friday, we began to see reasonably clear signs that President Obama would receive some kind of bounce in the polls from the Democratic convention.
Mr. Obama had another strong day in the polls on Saturday, making further gains in each of four national tracking polls. The question now is not whether Mr. Obama will get a bounce in the polls, but how substantial it will be.
Some of the data, in fact, suggests that the conventions may have changed the composition of the race, making Mr. Obama a reasonably clear favorite as we enter the stretch run of the campaign. [cont.]
Nate Silver, New York Times