Even if the economy improves, it will not go away by November. It is not about the economy, primarilly. That's what 'rats always think--"people just vote their pocketbook." I remember a shocked campus liberal telling me after the 1994 elections--"it just goes to show that if you spend enough money you can get people to vote against their own interests."
They were wrong in 1994, and they will be wrong this year.
if the economy turns around and companies start hiring, the Republicans will be toast in Nov as Obama and his friends in the Media will spin any good news to favor the Dems.