ELEVATING THE DISCUSSION. The AP's David Yepsen did indeed get in a quick acerbic dig at yesterday's GOP presidential debate after Rudy Giuliani said his plan to rebuild America's infrastructure would be to cut taxes. It didn't seem like it registered among any of the contenders, though. Giuliani's answer typified the rock-hard commitment to vacuous conservative nostrums and inane dogma that the candidates have ably maintained in debate after debate. I keep waiting to see that commitment break somewhere, sometime, from one of these guys (Ron Paul excepted), but it hasn't happened.