If McCain looses this election. It will be his fault.
Yes. He will make it easy for Clinton to win.
Obama has also made it easy for his opponents (both Hillary and McCain) to win. He (Obama) is on the road to self-destruction, and he is getting weaker by the day. People are starting to take a second look at him, and they don't like what they see. All it will take is the defection of a few delegates, and the Dem nomination is Hillary's. Obama could be gone by the end of the summer.
A McCain and Obama contest would be between two weak candidates. That's the only type of opponent McCain can beat.
If you put McCain up against Hillary, she will win. She is tenacious, young(er), and toughened by recent contests. By then she will have the MSM machine firmly behind her.
Why risk it?
Let Obama take Hillary out first, and the rest of the Dem party with him in November.