This is a meme they've been trying to push since January 21, 2010: scorn for anyone who suggests that Bush might have been involved in tanking the economy. Even though Bush isn't particularly popular among conservatives, it's difficult for them to let go.
After a decade (or more) of upper echelon conservatism pushing for a united front (even against all logic), it's hard to break ranks and argue against core positions. So they continue to make excuses and avert their eyes.
It's all about core positions: if Bush was wrong about the tax cuts for the rich, then the tax cuts should end. But if tax cuts created jobs, Bush would have had record low unemployment, instead of hemorrhaging jobs. If deregulation was a good idea, then the free market would fix itself, instead of collapsing.
To admit Bush was wrong, conservatives have to admit they were wrong. So, instead, the idea is treated with scorn, in the hopes that it will go away.
But sadly for them, it hasn't worked:
...the American public isn’t blaming Obama for the current economy, with more than six in 10 respondents still saying he inherited the country’s economic problems from his Oval Office predecessor.It's very sad. All that work, for nothing.
Also, while a combined 47 percent believe George W. Bush and his administration are "solely responsible" or "mainly responsible" for the current economy, just 34 percent in the poll say the same of Obama and his administration.
Meanwhile, this dates back to the inauguration, but it fits.