To actually have a targeted conversation with both base voters and
persuadable voters, your campaign needs to specifically identify them.
Identifying voters as supporting, opposing, or not decided on your
issue or candidate helps to focus your resources and find areas of
support (where you focus on developing leaders and turning out the
vote) and areas that need work (where you focus on persuasion utilizing
your local precinct leaders). This is known as voter ID, and it is done
in various ways.