Brazil presidential elections: Where will Marina voters go?

Ibope and Datafolha polls both shows Aecio Neves with 51% of valid votes, while Dilma Rousseff has 49%. Where will Marina Silva’s voters go?

First take of  Ibope poll: 64% of Marina Silva’s voters in the first round choose Aecio in the second round. Only 18% say they will vote for Dilma Rousseff. 10% blank/null and 8% have not decided.

Marina is delaying the announcement if she will support Aecio Neves. What reasons motivate Marina’s voters in the first round?

Your thoughts are welcome in the comments space below. Let’s try to understand what forces and ideas are in play.