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Like others in this thread, I'll be believe it when I see it. Oh look, no support for raising the gas tax. Who is surprised?
Actually changing transport/infrastructure in the US would require both 'carrots' to entice people to do something other than driving, and 'sticks' to push them out of their cars. The former is attractive and relatively easy so that's why we get positive noises from progressive politicians, but taking concrete steps to try and discourage people from driving would be incredibly unpopular which is why we're not going to see real changes any time soon. Remember, people are generally in favor of public transit, cycling, walking, etc for other people or as options, but almost nobody wants to give up their cars.