A key point is being overlooked by people who want to argue that Obama supporters have no standing to challenge Palin's inexperience:  the role of the voters in the primaries. 
 
The -voters- chose Obama to be the nominee of the party.  They took the measure of him as a candidate, with his strengths and his weaknesses (including his relative lack of experience), and decided that the former outweighed the latter.  Voters, of course, did not get to choose his running mate.  That responsibility was entirely on his shoulders, and that authority was entirely his to exercise.  He knew that he had a grave responsibility to choose wisely, and he made a sound choice -- one that balanced the political advantages of choosing a running-mate with the need to ensure good government.

McCain, however, exercised this same power to select his VP in an irresponsible manner.  It says a lot about how he plans to govern the country.  If he becomes President, we can expect to hear more phrases like "Great job, Brownie!"

Palin has no electoral mandate, and hopefully never will.