Sam Stein has an interesting nugget over at the HuffPo:
"It just proves his campaign is governed by tactics and not ideology," said Republican consultant Craig Shirley, who advised McCain earlier in this cycle. "In the end, he blinked and Obama did not. The 'steady hand in a storm' argument looks now to more favor Obama, not McCain."
Shirley added, "My guess is that plasma units are rushing to the McCain campaign as we speak to replace the blood flowing there from the fights among the staff."
Good point. In addition to McCain being congenitally erratic and possibly doddering, I'd guess the bitter factionalism among his top aides explains part of this week's bizarre performance.