What Bush Slide?

Mystery Pollster, among others, comments on President Bush's slide in the polls, but the graph on his blog hardly shows much of a slide. Yes, Bush is down a bit from where he was during the period from the election through his inauguration, but he doesn't seem to be any lower than he was through most of last year. Of course, Bush's numbers could go lower, but then again, they could go higher. Who knows?