Read this passage: A popular third party in Mississippi thinks it may be able to
get its candidate elected to the U. S. Senate. Party staff
work on strategies to build the candidate's profile and raise
funds on his behalf. Supporters donate their time by going
door to door and speaking to citizens across the state. On
Election Day, citizens turn out in record numbers to vote for
the candidate. On his first day in office, the new senator
thanks party members for their efforts.
Which groups that make up political parties are represented in the passage?