This country has gone completely bat-sh#t insane.
It turns out that "Many" comprises only about 3 percent... that majority of Americans stand with Israel and not with Obama/Kerry on the issue (i.e., Netanyahu is winning the argument)... that Democrats are badly split on the issue and that almost 60% of them prefer Obama's and Iran's interests and not Israel's, while more than 70% of Republicans are standing with Israel... that Americans are finally taking more interest in the [diminishing and mostly incomprehensible] role of the U.S. in the world, and apparently do not like very much what they're seeing.
Regarding only 16 percent "actually paying close attention to the complex Iran negotiations" — what is the point of trying to pay attention to Kerry's or Obama's pronouncements and/or ever-changing "conditions" that the agreement might entail? There is little coverage of them, and more importantly, we already know where Obama is going with it, and already know how the Senate and Congress are going to react, so "closely" following these two clowns' "negotiations" with Iran in the meantime is useless and liable to produce nothing but anguish and headaches.
What this poll shows (and it's skewed toward higher Democratic participation, as usual) is that Obama / Kerry already lost the public on this and his "foreign policy" and losing more every week, and are taking a lot of Democrats with them, and no amount of lipstick is going to make this pig into Miss America.