Hooraaaaayyyyy!
https://www.intrade.com/jsp/intrade/contractSearchIntrade now has a "winning party" market for 2016, as well as nomination markets for both parties. All the major 2016ers are listed there.
There were doubts for a while about whether Intrade would open 2016 markets any time soon, seeing as how they've banned Americans from participating (because of the court cases in the USA). But they've come through for us. We'll see if the volume ends up being way down from last time, because of the lack of US participation.
At present, only a few shares have traded on winning party, though the Dems have the edge.
A single share of Clinton to win the Dem. nomination has sold at 22.0, and a single share of Rubio to win the GOP nomination has sold at 17.7, but it's way too early to read anything into that. Have to wait for more volume before making further commentary.
2014 House and Senate markets have also gone up.