No.6059
Thanks to Marx's Hegelian lineage,you can certainly see a strong influence for the becoming side of things - but this seems like more of an accidental than a necessary relationship. It's very difficult for me to think of an argument about metaphysics that would change my politics, or visa-versa. (Everyone's favorite right-wing syphilitic crank, Nietzsche, was no less of a becoming enjoyer.)
There's a certain sense in which leftists need to believe that things in the social world are capable of change, rather than simply given in their behavior through an unchanging nature. But that's pretty divorced from metaphysics - certainly it's nothing that someone with an eternalist outlook on the metaphysics of time couldn't translate to their own language (that is, that different parts of the eternal 4D universe look different along the time axis just like they look different along some spatial axis.)