If Remainers win a majority of the vote in the European election, cancel Brexit

There’s a petition:

If this petition becomes popular in the run up to the European election, like the Revoke Article 50 one did with 6 million signatures, many remain supporters will think “I’d better vote in the election, and vote for a remain party”.

This will boost remain support and will put pressure on politicians to cancel Brexit, because the one thing politicians care about is votes.