That’s exactly how Bernie did it while Mayor of Burlington: the other elected officials in town pushed back against him and his policies, so for the next election Bernie rounded up like-minded progressives and convinced them to run for city offices. They ended up beating nearly all of the “old guard” politicians in Burlington politics quite handily - thus paving the way for Bernie’s policies to take effect. It’s a strategy that works quite well as it involves empowering average people to make things better for themselves rather than hoping the established elite will simply allow policies to be passed that are against their own best interests. You simply remove them from the equation. It is the very core of “Not me. Us.”