Doug Mataconis at Outside the Beltway has at least an initial answer to a question I posed not long ago about whether the Obama administration would alienate Hispanic voters by putting up immigration bills that were almost certain to fail. Here is the graph from Gallup:
This is too short a time frame to come to firm conclusions, since there were dips before (i.e. April 2010) that then saw a rebound. But how many policy failures will it take for those numbers to stay low?