Hillary Clinton's last shot to convince super delegates that she is the right candidate to take on John McCain in November hinges on her argument that she is more electable than rival Barack Obama. And Clinton polls better against McCain in the latest RCP Averages in Pennsylvania, Ohio and Florida. But a new survey from Wisconsin Public Radio and St. Norbert College suggests that in at least one battleground state key to any Democrat's victory, Obama has the electoral advantage.

The poll, conducted 3/25-4/5, surveyed 400 Wisconsin adults for a margin of error of about +/- 4.9%. Clinton, Obama and McCain were all tested.

General Election Matchups
Obama 46
McCain 42

McCain 46
Clinton 42

Any poll showing Clinton performing more poorly against McCain than Obama could seriously undermine Clinton's electability argument. It is no wonder, then, that the Obama campaign blasted the poll out to reporters as quickly as they could. If Clinton underperforms in Pennsylvania, super delegates not convinced that she's the most electable candidate could begin flocking to Obama in droves.