New York Times: Sens. John Kerry (D-Mass.) and Barbara Boxer (D-Calif.) both say there is little to read into the fact that Kerry is listed as the lead sponsor of the global warming bill (pdf) the pair unveiled Wednesday. But perceptions are another thing, and there are certainly reasons for why Kerry got top billing ahead of Boxer, the chairwoman of the committee with lead jurisdiction over the climate change agenda. The decision also leaves some observers asking who will be in charge moving …