Full Idea
Mandate Representation says they are delegates who should not deviate from instructions; Trustee says they use their discretion and judgement; Descriptive says they share group characteristics.
Gist of Idea
Representative should be either obedient, or sensible, or typical
Source
Andrew Shorten (Contemporary Political Theory [2016], 04)
A Reaction
[compressed] There is also being a representative because you have an audience (such as celebrity campains). The second type was famously defended by Edmund Burke. The third implies being the same colour, or gender, or religion.
Book Reference
Shorten,Andrew: 'Contemporary Political Theory' [Palgrave 2016], p.76