Greetings...
What I find interesting is that there is so much talk about the VP choice from the standpoint of "if something happens to the president". If you look back through history, how often has this really happened (at least in modern times)? The odds are pretty slim...
On top of that, the power of the president is limited, and rightfully so, by all of the checks and balances. Without approval from congress, no one person can make the kind of drastic changes that would legitimize the "oh my god - he'll (she'll) lead us to the brink of despair" arguments a lot of people seem to use when discussing political choices.
My two cents (and I am a Republican that will cross party lines to choose the best candidate for an office):
Obama - young, intelligent, charismatic, eloquent speaker. But, I think he is too young to make the tough choices, would need to follow the advice of the his supporting cast (instead of leading them), talks a good game but has few ideas of how to implement them and has an incredible lack of experience for a job this important. However, I think he has more than a reasonable chance of winning the election based on popularity. It's unfortunate, but too many in our country vote based on appearance and perception instead of taking the time to study the choices and make informed decisions.
McCain - not so young, intelligent, not so charismatic, not so eloquent when speaking. But, he has the moral fortitude, strength of character, experience and understanding of how things work politically to get a fair number of his agenda items approved and in place to drive some change. I'll be voting for McCain and Palin...
Respectfully...