Tom Jensen unveils the latest from Public Policy Polling — a remarkable survey showing that, in five key battleground states, endorsements from either Barack Obama or Bill Clinton would at this point be massively net-negative for Democratic candidates. First Obama’s numbers:

State More Likely Less Likely Net Illinois 26 40 -14 Louisiana 22 55 -33 Ohio 24 51 -27 Pennsylvania 22 50 -28 Wisconsin 19 50 -31

And Clinton:

State More Likely Less Likely Net Illinois 25 38 -13 Louisiana 23 47 -24 Ohio 27 44 -17 Pennsylvania 23 43 -20 Wisconsin 19 43 -24

As Jensen points out, the net negative is the result of both an enthusiasm gap between Republicans and Democrats — Republicans are much more turned off by Obama/Clinton endorsements than Democrats are turned on — and a continued flight of independents away from Obama and the Democratic establishment. On those independents:

In Ohio 6% say they’re more likely to support an Obama endorsed candidate while 57% say they’re less likely to. In Wisconsin it’s a 6/51 spread. In Pennsylvania it’s 10/56. In Illinois it’s 15/39 and in Louisiana it’s 16/49.

More here.