Progressive Democrats have been grousing for what seems like eons about the fact that some of the nation’s wealthiest corporations avoid paying their fair share in taxes. This weekend, the Senate inched a step closer to a fix when it approved a historic $370 billion climate and healthcare spending package that would be paid for almost entirely by new tax increases on large corporations. The measure seeks to end a decades-long trend that saw some of the world’s most profitable companies find ways to shelter their profits from federal income taxation, often by accelerating depreciation, offshoring profits, awarding stock options to executives and maximizing tax credits.