All Things D writes, So. The Jon Stewart – Bill O’Reilly face-off went about exactly as planned: Two extremely adept political entertainers delivered a show that was much more entertaining than anything we ever see from actual politicians. Except for this one problem: Lots of people who wanted to see the show, which was only available over the Web, couldn’t watch. The “Rumble 2012″ Web site seemed unable to process orders for many customers — the show charged $5 a head — and some of those who did get through reported other technical problems. What happened? The only word...