Nearly two out of three undecided voters say that the presidential candidates' positions on global warming will influence their vote in the upcoming election, according to a new national survey released jointly today by researchers at the Yale School of Forestry & Environmental Studies and George Mason University. Consistent with other recent polls, the survey found that 48 percent of registered voters said they will vote or are leaning toward voting for Barack Obama, while 39 percent say they will vote or are leaning toward voting for John McCain. Nine percent of registered voters were still undecided as of Oct. 14.