I am rooting for Jen & Lekisha because they seemed to have always been behind this whole race, and run into different problems here and there that they've overcome. They got college educations and through athletics are competitive, and I see some of their tactics as very driven and their athletic background, not necessarily trash talking, but strategizing and finding some small psychological way to get a little advantage (a little psychological offense can be the best defense), is what has kept them in the game (along with a little luck).
Margie and Luke I rooted for in the beginning, but they were at the front of the pack so much that I saw them kind of grow accustomed that that was their place, and now that the race is down to 4 (and the past few episodes) they are getting really tense with the competition. And some of the behavior seemed to me to be some entitlement? (I could just be more sensitive with this, I work at a University and there is a difference between those who've had to work for everything in life and those who have been hand-held, and I see Luke in the latter category and the sisters in the former).
I thought it was great that the sisters got to the mat first - both other teams had multiple wins and prizes. I am all for any of the 3 winning, but agree with the former poster, Cara & Jamie, I don't want a team to win who has a member so negative and abusive to the locals!