DENVER -- If there were any questions remaining about why Barack Obama chose Joe Biden as his running mate, Biden answered them tonight.

Most of all, what Biden showed when he spoke at the Pepsi Center was the particular combination of skills and experience that he brings to the ticket. As he said, he learned from his mother (the surprise star of the night) at a young age that when the bigger boys knocked him down, he needed to right back out and bloody their nose. He'll be asked to do plenty of that over the next few months, and he got an early start tonight by taking some sharp jabs at John McCain. And he also gave plenty of attention to foreign policy, loading his speech with the kind of details that Obama needs him to bring.

Having told you what I thought, though, once again, I want to know -- how do you think Biden did tonight?