As the Republican convention nears, someone in the Kerry campaign has distributed some interesting statistics from past presidential races:
* The average winning incumbent has had a job approval rating of 60%. Indeed, every incumbent who has won reelection has had his job approval in the mid-50’s or higher at this point. In recent polling, Bush’s average approval rating has been 48%. President Bush must emerge from his convention having dramatically altered public perception of his performance in office.
* In recent years, when incumbents have gone on to victory, 52% of voters, on average, said the country was on the right track. Now, just 37% think things are moving in the right direction. Thus, President Bush must convince the electorate that the nation is in much better shape than voters now believe to be the case. Every incumbent who has gone on to be reelected has had a double-digit lead at this point.
* Following their conventions, the average elected incumbent has held a 16-point lead, while winning incumbents have led by an average of 27 points. Bush will need a very substantial bounce to reach the mark set by his successful predecessors.
* Incumbents have enjoyed an average bounce in the vote margin of 8 points.
* On average, incumbents’ share of the two-party vote has declined by 4 points between their convention and Election Day.
President Bush has the opportunity to achieve an average, or even greater, bounce from his convention. Typically, elected incumbents go into their conventions with a 9-point lead, while incumbents who have gone on to win enter their conventions with a 21-point lead. Most current polls show the race quite close. This gives the president substantial room to bounce. By contrast, Senator Kerry entered his convention in a far stronger position than the average challenger. The average challenger goes into his convention 16 points behind, while Senator Kerry entered his convention with a 1-2 point lead. This gave Senator Kerry much less room to bounce.
Obviously the point here is to point out that the typical incumbent receives a much larger bounce from their convention than Bush is going to receive, thus downplaying the impact of the GOP convention.
I suspect Bush will receive roughly the same type of convention bounce as Kerry got last month–not a very large one. Unless there’s a significant event which shakes up the race, I expect it to remain close (margin of errorish) into October. Ultimately, the winner may open up some space between the loser, but that break probably won’t come until late in the campaign.