Oh, God! I was one of the John McCain supporters (I am too conservative, and a bit afraid of liberal). Since when have I started to sound like a real Obama people?!
Really, personally, I think Obama vs. McCain. It's even. Either way, you will have some gains and some losses. However, Obama-Biden vs. McCain-Palin, the former would be a much safer and better choice. At least Obama could give people a hope on what he could do differently.
I truly believe that Obama won't be worse than Bush. Bush was very lucky to have the chance twice. Why don't you give Obama a chance?
Of course, it's your country, your decision.