As I posted on the CU thread:
Got your PM. I don't feel the Clinton ball is authentic. I believe that is a forgery styled after one of his "neat" signatures. Look how slowly drawn it is as evidenced by the "pooling" of ink in several locations. Look at how the signature lacks the fluidity of anyone's genuine signature. Plus, he usually doesn't sign balls with his "neat" signature and also, generally doesn't sign balls in blue pen as he typically carries a black marker/pen and doesn't switch writing utensils usually. (of course, depending on your relationship with him, he might, but for John Q. Public, typically not). I know I would not be comfortable with the Clinton ball even if it did manage to get a third party COA, I'd still pass.
On the Obama, I haven't done much, if any study on him or his signing habits, so I'm not going to opine on that one.
Others may have different opinions, but I wouldn't buy that ball for $10.00 if offered to me (unless I wanted to play catch with it
)
Mike