These are target groups.
A political campaign can never reach all people equally. Both staff and financial resources are limited and so it campaign time.
A target group is a specific group of people with shared characteristics who are most likely interested in the proposed political issues.
If the party's agenda is to change the immigration laws for example, it would target African Americans and Latinos as they represent the target group that would support the party's policy. In other words, they would vote for the party.
Targeting is done to ensure that a political party has enough support to win an election or to push an executive order.
