Blinder is currently helping promote Hillary's campaign in a variety of ways. Of course this "research" is biased.
Under the Clinton years, the tech industry exploded. Of course the economy was great. But while Al Gore claims ownership over inventing the internet, it was coincidental that Clinton was in power as these technologies finally matured to the point of mass adoption.
You also had some of the most massive frauds going on during the Clinton years, such as Enron, Worldcom & Tyco, cooked books that helped give the illusion of a better economy, people believed they had more money than they actually did.
So when Bush took office, he was hit by a triple-whammy, the 9/11 attacks, the tech boom falling back to reality, and the frauds unraveled.
None of these things were Presidential-related, and it's difficult to pin-point if they were politically-related at all.
And we have to go into arguing what led up to the housing crash. Oh, and certainly let's not forget that the major starting events of the financial crash occurred just a few months before the 2008 elections. If it happened in 2005, Bush's overall performance is better, and Obama's is worse. What caused the crash to occur exactly when it did and not earlier?
When you just run the numbers and say the Democratic Party is better because GDP rises more when a Democrat holds the Presidency, it's a biased report meant to influence the upcoming election.