The majority of undecided voters in the U.S. presidential race say that the candidates’ views on global warming will be an important factor in determining how they vote, according to a new poll. While very few participants called global warming their single-most important issue, about 61 percent of undecided voters say it will be one of several important issues that influence their decision. Probable voters for President Obama were far more likely to consider global warming important (75 percent) than likely Mitt Romney voters (32 percent), according to the poll, which was conducted by the Yale Project on Climate Change Communication and the George Mason University Center for Climate Change Communication. From two-thirds to three-quarters of undecided and likely Obama voters also said they believe the president and Congress should be “doing more” about global warming. Only about a third of likely Romney voters said the president or Congress should be doing more.