You can buy Vote for Change tour tickets right here, right now. I scored two tickets for the Springsteen/REM/Bright Eyes show in Cleveland. Total cost was $177, which is on par to what Springsteen would be charging by himself.
An interesting step in the purchase process was I had to list my occupation and employer, and agree to a few things because I gues the ticket purchase is a sort of campaign contribution.
// Discuss the tour here, in our message board.