In July 1979, Carter had an approval rating of 28% and an umemployment rate of 5.7%.
(Doesn't make sense if you put it like that, but I guess there was other... stuff. )
In July 2011, Obama had an approval rating of 47% and an unemployment rate of 9.2%
What the- when did the hostage crisis start again?
In November 1979... so not a factor in July.
But there were other factors contributing to Carter's 28%. Exploding inflation, the second oil crisis, a general sense of incompetence regarding the administration.