Senator Kerry ponders the fact that he has been drinking lead-tainted District water for the past 20 years.

Let's review what we know:
Kerry lives in Georgetown, where it seems that 52.5% of the randomly tested homes displayed elevated lead levels, defined by the EPA as containing greater than 15 parts per billion. Kerry has lived here for twenty years.

Therefore, let me make the following suggestion: perhaps Kerry flip-flops because his lead-addled brain doesn't actually remember his original position!

Maybe there was something to Howard Dean's whole "Washington outsider" spiel ...