What a waste of time. For the most part people going to vote have their minds made up so somebody handing a card in front of the voting place is not going to persuade them. A better use of volunteers is to identify your voters and make sure they get to the polls. Call them , give them a ride or whatever it takes.
The only poll worker that matter's is the candidate in a local election but that could cut both ways . A few years ago I was impressed by a School Board candidate that I met on the way in and voted for the guy. The flip side is I talked to a candidate for a local office and he was clueless so I didn't vote for him.
1 hour ago