I can’t fathom that the Catholic vote is evenly split. Obama is the antithesis of some of the most fundamental Catholic tenets, most of all abortion. It’s obviously is not a poll of practicing Catholics, at least I hope so.
There are many Americans who are Catholic by upbringing but do not support the tenets of Catholicism with their ballots. It is a fact of American political life. They are Kennedy Democrats and have overlooked the fact that JFK would not tolerate the policies of the Democrat Party today (Bobby might though).