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Back in 2016, I was able to convince many of my die-hard Hillary supporting friends to switch their vote to Bernie after inviting them over for watch parties of televised Bernie events (the debates, town halls, etc).
This is one of the easiest ways to get undecided voters on board with Bernie because they get the full context of what he is saying, while being surrounded by Bernie supporters cheering him on. It gives people a sense of community in rallying around a candidate that is speaking to what they believe in.
You can also create an event on Facebook, or via organizingforbernie.com so that others in your community may join in.