Democrats allied with Governor McGreevey scuttled a landmark reform bill Thursday but in the process helped make a hero out of the reformer - an inexperienced Republican lawmaker by the name of Thomas H. Kean The bill, which places new limits on the old political custom known as "pay to play,'' was summarily derailed by Assembly Speaker Albio Sires, D-West New York, who cut off all debate and ordered the measure back to committee without a vote. For nearly 90 minutes, Sires stood at the speaker's podium, ignoring repeated requests from Kean and other Republicans to be heard. Kean, appearing...