At last an explanation...

A recent poll says that most of those planning on voting for George Bush don't actually know what his positions are on most issues. Surprisingly, given the campaign rhetoric about how confusing Kerry is, and how you can't know where he stands, most of his supporters, and most undecided voters did know Kerry's positions on the same set of issues.

As the nation prepares to watch the presidential candidates debate foreign policy issues, a new PIPA-Knowledge Networks poll finds that Americans who plan to vote for President Bush have many incorrect assumptions about his foreign policy positions. Kerry supporters, on the other hand, are largely accurate in their assessments. The uncommitted also tend to misperceive Bush’s positions, though to a smaller extent than Bush supporters, and to perceive Kerry’s positions correctly. Steven Kull, director of PIPA, comments: “What is striking is that even after nearly four years President Bush’s foreign policy positions are so widely misread, while Senator Kerry, who is relatively new to the public and reputed to be unclear about his positions, is read correctly.”

Majorities of Bush supporters incorrectly assumed that Bush favors including labor and environmental standards in trade agreements (84%), and the US being part of the Comprehensive Test Ban Treaty (69%), the International Criminal Court (66%), the treaty banning land mines (72%), and the Kyoto Treaty on global warming (51%). They were divided between those who knew that Bush favors building a new missile defense system now (44%) and those who incorrectly believe he wishes to do more research until its capabilities are proven (41%). However, majorities were correct that Bush favors increased defense spending (57%) and wants the US, not the UN, to take the stronger role in developing Iraq’s new government (70%).

So, the answer to "How can they possibly want to vote for that man?" is, basically, that they don't know what they are doing.