Okay two things being speculated on twitter:
1) Kaiser apparently has done polling on ACA before, and generally has slightly more positive numbers for ACA than most.
2) There are questions whether this sample polled all adults, even those who aren't registered to vote, which could explain the fishy presidential vote sample.
At this point, Landrieu's number in LA seems okay, KY seems about right, NC seems in like with what we've been seeing. I think Pryor is up by 3ish in Arkansas, but 10 is hard for me to believe.
Given that there is over 7 months left in this race these are still bad numbers for any to be at since all them are well below 50% and have mediocre approvals overall.
I actually take these numbers as esp concerning for the Democrats given the larger picture mixed in with their current numbers. As all of the incumbent Senators polled in this survey are from Southern states where Obama and his party are both deeply unpopular.