The issue here is that while lots of people know about Matt Ryan's Constantine, and there is a drive to have Matt Ryan reprise the role of John Constantine again.. at this point there is no petition to actually attempt to bring this about.  What this petition is requesting is to have The CW and all parties involved (including Matt Ryan, David S Goyer, Daniel Cerone, the casting company for DC's Legends of Tomorrow, El Ray, and anyone else) start talking about making this happen.  Matt has a UK agent and an American agent, plus does voiceovers, so he should be easy to reach.  David S Goyer has expressed regrets of Constantine ending, Daniel Cerone has been a big supporter of the show, now we just need everyone to start talking about making this happen!  Remember, it's the support that shows the networks what you'd like to see!  If you'd like to see Matt as Constantine on "LoT", then please sign this petition and get it out there!