Here are some reasons I gave to choose Obama.
International respect and influence. Most of the other first world nations citizens are praying-- eight or nine to one-- for an Obama victory. If Obama wins, he will be beloved by the world like no president since JFK. Now, the right wingers may mock the French and engage in xenophobia, but stronger international relations are essential to the USA's future.
Consider that as the economic crisis worsens, as all the experts predict, a global economic response will emerge. A USA with the weakened, diminished stature the Bush/Cheney/Rice administration has produced will be far less effective and influential than a strong Obama administration embraced by the world.
Then there's McCain's relationship to technology, or lack of it. You don't need to be an IT expert, but you should at least have a handle on the technologies that are changing the world. Failure to be able to navigate even the simplest uses of computers indicates a lack of curiosity, a dependence upon others that keep McCain in the dark, so he really can't full grasp the full power and potential of technology. We need a leader who at least gets the technology enough so he can see its potential so he can ask for the next level of performance.
Next, McCain's judgment:. I'm talking about Sarah Palin. Can you imagine her engaged in a serious discussion with another leader of state- Gordon Brown, Vladimir Putin, Nicolas Sarkozy? They would certainly not take her seriously. A majority of Americans do not believe she is capable of taking over as president. Look at her embarrassing interviews with Katie Couric. Sarah Palin may be able to throw nasty verbal attacks in front of crowds, but she's no leader. McCain either failed to properly vet her or he knew it all along and he went with her because he thought she'd add enough to his campaign to help him win, even though she is so clearly, obviously not presidential. McCain chose to make a choice that supported his campaign at the price of offering a seriously capable candidate for VP. She may be mavericky, but underneath it all, there's very little there and you have to blame John McCain's judgment for putting her a 72 year old heartbeat from the presidency. What an insult to America. She'd make Dubya , who many historians agree is the worst president in history, look good.
You may not know Obama as well as you like, but in the last two years, you've had a chance to see him operate. You've probably received emails or DVDs or seen attacks on him. But if you go with your observations of how he's handled himself, what's he's actually said and done, I think you'll have to conclude he comes up looking to be the better man. And that's what America needs today.