Politico: As the clock ticks on a self-imposed deadline, Rep. Henry Waxman is facing fire from all sides over his landmark measure to curb carbon emissions. After months of haggling, he still doesn’t have a deal that moderates will support. On Wednesday, he had to back offhis threat from a day earlier to skip a key subcommittee vote after members raised a ruckus. And, to top it all off, the president and others are breathing down his neck to wrap up work on climate change so that Waxman can …