Depends on what you mean by worse. Taking Kerry at his word (always a dubious task) it's a fair bet he would have named a nominee who met with the expectations of his voters. Such a nominee would be known as an advocate a living constitution and pro-abortion.
I said other than Roberts. Meirs is a complete gamble.
I think, sadly, that the gov't works best with utter gridlock.
The GOP has shown that they are only a drip better than the RATS.