Concerning the claim they nailed the jungle primary results, I would love to see what share of the vote they gave to the two republican candidates, the problem with many #LA-GOV polls is that they underestimated greatly the share of the vote obtained by the two republicans, not that they failed to predict the JBE’s share.
This claim has been made a few times in this thread. The problem is that there's not really any evidence that this is actually the case — the explanation is simply that the most likely people to be "undecided" in a contested election with two Republicans and one Democrat are Republicans. If you look at the polls that actually pushed those undecided voters, you'll see that they did a pretty decent job of figuring out the final vote shares.
Rispone+Abraham final: 51
Trafalgar: 48 (MoE of 3)
Data for Progress: 48 (MoE of 3)
Emerson: 44, but with 4% to the Landrieu and 3% to the no-name R