The poll surveyed Americans who said either that they were not likely to vote or that there was a 50-50 chance that they would vote. (Many of them were not registered to vote, and even among those who said they were 50-50, some tend to over-estimate their likelihood of voting.)
This group, despite being largely disengaged with the presidential campaign, has a generally positive view of Obama (55 percent favorable to 37 percent unfavorable) and a starkly negative view of Romney (25 percent favorable to 51 percent unfavorable).