I now make the bold proposition that Palin will outdo Biden this year for Gaffe King Queen.
Based on...what exactly? Because her daughter is pregnant? Or is it because she got a speeding ticket once (this attack didn't come out yet)?
Based on her inexperience as a campaigner. It happened to Obama and it's bound to happen to Palin.
Then shouldn't Palin be challenging Obama, and not Biden, for the gaffe king/queen/kiueen title?
No, you're missing the point. Obama has made a couple gaffe's but he learned his lesson. Biden, by most common conceptions, is the gaffe king. Obama knows this and probably plans to keep him on a tight and short leash.
Palin will go through the steps of learning from her mistakes, like Obama did.