The initiative to hold a Science Debate among the US Presidential candidates is not going well. The planned debate to be held in Philadelphia has been canceled, and the organizers hope to schedule another one later in Oregon.
At this stage, I'm skeptical that it will occur. As the article stated, the candidates at this point are "well-defined" and don't need any more publicity. And science isn't anywhere near the important factor that the general public would consider in making their decisions on who to vote for.