Social Security Reform
My take: if the President said that the system was perfect, we'd be hearing how there is an imminent crisis and Bush is irresponsible in his failure to address it.
In other words, many on the left hate Bush, and reflexively oppose whatever he proposes. If he says it, they're against it.
Why do I say that? Because during his second term, President Clinton referred to the looming Social Security crisis on multiple occasions, but we heard jack from the left then about how he was off his rocker.