Blue Wave Postcard Movement Individuals buy packs of 100 postcards for $12 preaddressed to100 different Dem voters in swing states. The cards explain how to get a mail-in ballot. The buyer gets stamps and adds a personal line about how important voting is, and mails the postcards to voters. This was started by women here in Boulder, CO. One of the leaders said that young people believe in a more progressive future. They will work for it if politicians inspire them.