NEW YORK — Rep. Alexandria Ocasio-Cortez mocked Elon Musk’s plans to charge for a blue Twitter checkmark, sparking a war of tweets that continued through Wednesday night. “Lmao at a billionaire earnestly trying to sell people on the idea that ‘free speech’ is actually a $8/mo subscription plan,” the New York City Dem quipped on Tuesday night. Musk directly responded to the tweet on Wednesday,…