Nail in the coffin for G.W. Bush's approval ratings?

Thanks to Yahoo and the Associated Press for this little winner. It seems that G.W. Bush plans to stay home for Former President Gerald Ford's state funeral. While he intends to make a showing at the viewing, and he intends to say a few words at the church, the sitting President has decided to bow out of the state-sponsored formal funeral proceedings. I guess the question that will remain on everyone's minds will be whether this was a decision of the Bush family or the Ford family. Could this decision be the nail in the coffin that defines G.W. Bush's public approval ratings? And will it move him up the list into the Top 5 Worst Presidents in history, if he wasn't already firmly entrenched in the top 10?