r/VoteDEM is a startup subreddit that is focused around winning political seats up and down the ballot.

In their own words

Welcome to /r/VoteDEM!

Be the blue wave!

Donate to take over the Senate in 2020!

Be a volunteer from home!

Join your local Democratic Party! Google "[Your state] Democratic Party", find the link to the local parties page, and get in touch with your county's party chair. You could even become a precinct committee member! In some states (like Pennsylvania), that means you get to help pick candidates for special elections!

Are you technology-oriented? Volunteer with Tech for Campaigns to help smaller campaigns get up and running.

Run For Something! There's no position too small to benefit from a progressive public servant. Be part of the next blue wave!

Make a comment here talking about the work you’ve done, earning valuable karma and facilitating discussion, which will encourage others to do the same!"