Part of the brilliance of picking Palin as VP was that it caused the McCain campaign to sucker the left into bringing up "experience" as a issue again. This is an issue where Obama is very week.
Obama was a nothing state legislator who got into the U.S. Senate when his opponent (Jack Ryan) was involved with a "sex scandal" with his own wife, Jeri Ryan. As a U.S. Senator, Obama has not really championed any legislation to speak of or otherwise set himself apart as a Senate leader. He just really has not be a senator long enough for that.
OTOH, Palin, as the Governor of Alaska, has made sweeping changes, and has some executive experience. Is she ready to be President? No, but then she is not running for President. Is she more ready than Obama? Here I would say "Yes". This is where the Republicans need to hit the Democrats, and it looks like they are starting to do so.