work in cooperation with the national committee and town and ward committees
organize and work for the nomination and election of party candidates
What does the ward committee do?
What does this mean? For example, if you and many of your neighbors felt addressing traffic congestion is a one of the top priorities in Eastie, then the Eastie Dems (let’s call the Ward Committee that — sounds friendlier) should know that, recognize that, and act accordingly in their decisions and campaigns.
conducting caucuses in order to elect delegates to represent the ward at party conventions (These delegates then vote to endorse candidates)
For instance, in Markey vs Kennedy for the US senate seat nomination, the delegates will decide in the state convention.