[brianglick]

Beyond the usual "email / write / call your state congressperson," are there any effective ways to lobby for changes to Prop 13?

[tingletech]

It only takes a simple majority vote to change it, you just need enough signature to get in on the ballot.

[bufordsharkley]

It's worth noting that the Howard Jarvis Taxpayer's Association[0], the group that originally passed Prop 13, fights for its continued existence as a dedicated lobby, and they're extremely well organized.

[0] http://www.hjta.org/