President Biden is burning rubber away from the midterm campaign trail. The 79-year-old took his 1967 Corvette Stingray for a spin on an episode of CNBC’s “Jay Leno’s Garage” that aired Wednesday night. Biden’s green convertible, featuring a 350-horsepower V-8 engine and a four-speed manual transmission, was no match for Michael Powell’s more powerful automatic 2015 Stingray