Source of the ill will towards Zapatero?
Zapatero has weighed in on this year's election, publicly backing McCain's opponent, Barack Obama.
"Yes, I like him," he told the Financial Times when asked whether he'd like to see Obama in the White House.
I wouldn't consider that a flat-out endorsement (he didn't say he opposes McCain), but its about as close as a foreign leader can come without going over the line. So its understandable if McCain might hold a grudge against the guy.
Still, it would be nice if we had a President who didn't govern based on personal slight.