Expect the bigger bounce for Romney

Each party convention usually produces a bounce in the polls of 6 to 10 points, though they often cancel each other out. But this year there will be different. The Republicans will gain much more from their convention than the Democrats will from theirs. This year, there will be no offsetting bounces; the advantage will be Romney’s.

The parties go into their respective conventions with very different tasks in mind. The Republicans need to use their conclave to wipe off the grime with which Obama’s campaign has largely succeeded in covering Mitt Romney. The Democrats will want to continue to besmirch both the opposing party and its nominee and to use the convention to sully the image of the newly minted GOP vice presidential candidate, Paul RyanPaul Davis RyanHenry Kissinger, Tim Cook among guests at White House state dinner Overnight Finance: Stocks fall hard | Trump sending delegation to China for trade talks | SEC fines Yahoo M over breach | Dodd-Frank rollback dominates banking conference To keep control of House, GOP must have McCarthy as next Speaker MORE.

But the four-day format of dramatic speeches, films and delegate interviews has historically been very good at fleshing out the biography of the candidate. It has not, however, been historically effective as an instrument of negative campaigning. So the Republicans are much more likely to achieve their goals than Team Obama is.

History is full of successful biographic conventions. Even when the candidate’s biography — as elaborated at the convention — turned out to be a mixture of lies and exaggerations, when the convention was gaveled to a close, the American people largely accepted it, if only for the moment, as accurate. Frequently, the warm biographic glow spawned by the convention went away as the campaign wore on, but the fact is that the convention had established the candidate’s biography, even if only temporarily.

In 1984, Walter Mondale left his convention with his image glowing after selecting Geraldine Ferraro for vice president. Through September, her image was in tatters, but it worked at the convention.

In 1988, Michael Dukakis sold his immigrant heritage and surged to a 17-point lead. He lost it in a tangle of hot-button issues, but the convention succeeded. 

At the same time, George H.W. Bush, with an assist from speechwriter Peggy Noonan, convinced us that he was “a quiet man who heard the quiet voices” as he searched for “a thousand points of light.” 

In 1992, the glow of the comeback kids — Bill ClintonWilliam (Bill) Jefferson ClintonTrump denies clemency to 180 people When George W. Bush stood with Hillary Clinton Feehery: The problem with the Dem wave theory MORE and Al GoreAlbert (Al) Arnold GoreMellman: Memories may be beautiful, yet… Hamas attacks Israel — and the world condemns Israel Al Gore: Trump should fire Pruitt MORE — was firmly established and their generational theme well-articulated. 

In 1996, Elizabeth Dole framed her husband Bob’s biography in an Oprah-esque narrative that brought the candidate the only dash of warmth in his long political career.

In 2000, George W. Bush sold the idea that he was a “compassionate conservative” with a heavy emphasis on education.

In 2004, Lt. John KerryJohn Forbes KerryMellman: Memories may be beautiful, yet… Lieberman: Senate should fulfill constitutional duty, confirm Mike Pompeo Overnight Defense: Pompeo clears Senate panel, on track for confirmation | Retired officers oppose Haspel for CIA director | Iran, Syria on agenda for Macron visit MORE emerged as a Vietnam war hero, only to be swift-boated in the weeks to come.

And, in 2008, Obama presided over the mother of all biographic conventions as his shining star burst forth over an unsuspecting and gullible country.

And so the 2012 Republican convention will probably succeed in introducing Romney and Ryan and in covering them with accolades, which will help to offset the pounding to which Obama has subjected them.

Will Obama succeed comparably in his negative convention mission? Not very likely.

Conventions aren’t good at throwing negatives. The only success that comes to mind was the 1964 assault on Barry Goldwater led by Hubert Humphrey.

The 1992 Republican convention failed to hurt Clinton. Despite wall-to-wall negatives aimed at both Clintons (more Hillary than Bill), it was the only convention in recent times not to produce any bounce for its candidate. Clinton had trailed badly — often running third to Bush and Perot — until his convention, but  he never relinquished the lead thereafter.

Democrats will be so focused on the negative — exploiting Todd Akin’s remarks, attacking Ryan’s budget, ripping Republican Medicare proposals and talking about Bain Capital and Romney’s tax returns — that they are likely to create a disturbing, hard-to-watch convention that will fail to offset Romney’s biographic bounce. 

The convention is a show. Americans love to see positive, inspiring, uplifting performances. Negatives turn them off and depress the ratings. Who wants to watch four nights of accusations?

Morris, a former adviser to Sen. Trent Lott (R-Miss.) and President Bill Clinton, is the author of 2010: Take Back America — A Battle Plan and Outrage, Fleeced and Catastrophe. To get all of his and Eileen McGann’s columns for free by email or to order a signed, advanced copy of his latest book Revolt!, go to dickmorris.com.