I think Biden was overall a “meh” pick as far as America is concerned. McCain has a lot of options that could be more energizing. Palin would be one. I think Lieberman is another. Romney - well, he may have some desired conservative credentials, but I still think he would be a “meh” pick.
A Lieberman pick would be the same as a Biden pick. He is also an abortionist and would turn off too many people.
Actually, Biden was the best of the bunch. Many republicans I know wanted him for the Presidency rather than McCain. It was a smart choice. If McCain takes Romney, it’s all over.