It's looking like 2013 is going to be bad economically no matter who wins the election. If Romney wins, Obama coming back on a "See! I told you!" theme in 2016 is entirely possible.
Conversely if Obama wins, the Republicans will be the odds-on favorites to win in 2016 unless rent by internal division.
This sums it up. A Romney presidency could go either way, but significant economic improvement in the future seems somewhat doubtful. And, of course, it would matter who Romney's challenger was, too.