These are the latest results of a Pew Research Poll that had previously shown a lesser gap but still a very decided gap between Republicans and Democrats. The gap is growing and in fact, according to the latest survey the difference is astonishing:

Republicans generally outperformed Democrats on the current quiz. On 13 of the 19 questions, Republicans score significantly higher than Democrats and there are no questions on which Democrats did better than Republicans. In past knowledge quizzes, partisan differences have been more muted, though Republicans often have scored somewhat higher than Democrats.

And part of the reason the gap is growing is because as people break through the media blockade and find things out for themselves, they abandon the Democrats where only the least informed remain. I suspect the same is here with Libs versus the ALP.

Source for these results: Some interesting investigation in the comments with the source of these results now tracked down by Cold-Hands to a survey conducted in October 2011. The quotation is, however, exactly as it was printed in the Pew Survey so unless there has been some massive change in their knowledge base, the conclusions are exactly as stated above.