This article in The Intercept explains the shakeup:
Sen. Joe Manchin May Not Be Kingmaker in West Virginia for Long. The WVDP website is in disarray, but I’ve been told it is under development. Mike Pushkin, member of the West Virginia House of Delegates, is now the party chair, and he is focused on rebuilding the party. If you’ve been holding back getting involved, step forward. With the Supreme Court trampling citizens’ rights and the threat of Republican-backed legislation to further the trampling, there is no time to waste. Reach out. Do not estimate the power of solidarity.