KERRYVISION You Have To See It To Believe ItCNN'S CANDY CROWLEY:Â "John Kerry out looking at the Grand Canyon today, stopped by reporters. Among the questions asked, 'If you knew then what you know now, would you still have voted for the Iraq war resolution?' Here, we believe, is his answer." KERRY: "I'd challenge the president back. But I'm ready for any challenge and I'll answer directly. Yes, I would have voted for the authority. I believe it's the right authority for a president to have. But I would have used that authority as I have said throughout this campaign,...