A: Who's going to be my partner?
B: Maybe I will.
C: But you also have an exceptional candidate in me!
Why did C say like that? What is the meaning of 'in' here?
If you know the Randy Newman song "You've Got a Friend in Me", it's the same use of in: https://en.wikipedia.org/wiki/You%27ve_Got_a_Friend_in_Me
"You've got a friend in me" = "I am your friend"
"You have an exceptional candidate in me" = "I am an exceptional candidate for you"
C thinks he/she is a good partner for A.
However, it doesn't necessarily mean that A sees an exceptional candidate in C.