Well, taking that a bit further, in whom should citizens loving the values of our forefathers have voted for in the primaries, and that would be neither Obama nor Romney. But we are now faced with distasteful choices in the general election.
However, the title of the article is specifically limited to address the segment of the population who are, within the text, identified as regenerated believer-disciples of Christ -- not just persons who simply practice religious formalities prevalent in Christendom and thus call themselves "Christians." Thus for the constituents addressed, your question is another question, but not a "better" one.
With sincere regard --
I think it is a better one, and for this reason: I don't like the idea of dividing up the vote based on people's religions. If Christians should only vote a certain way, does that mean that atheists & agnostics should do the same? While I recognize that most of my "fellow" unbelievers will vote for Democrats (about 70% of them, according to polls), I'm not about to go along with them, as I'm very conservative on economic and foreign policy issues.
Similarly, I would guess that Obama will win 90% (at least) of the Muslim vote. It's fair to say that they're voting based on their religion far more than Christians do. Is that a good thing? Not in my book.