That's a question I've seen people asking lately.  For example, here's a conversation I had on Facebook:

Below are some links that might help for anyone else asking that same question, but first here are a few of my reasons:

• I desire a foreign policy that is less bellicose and more reliant on international cooperation and diplomacy
• I support generous treatment of immigrants
• I believe that the policies of the Democrats are more likely to reduce the abortion rate
• I believe that we need to protect the environment and can't depend on "the market" to do it for us
• Though I realize this is a gross oversimplification, I feel more kinship with a party whose focus is on the poor and powerless rather than on the rich and powerful
• I am confident that Obama has a first-class intellect and temperament, qualities that are highly desirable for the job of president

How a Christian Can Vote for Obama (link)
Henry Neufeld

Frank! As A Former Pro-Life Leader How Dare You Support Pro-Choice Obama? (link)
Frank Schaeffer

I'm Catholic, staunchly anti-abortion, and support Obama (link)
Nicholas Cafardi

Pro Life - Pro Obama (link)

Interview with Donald Miller (link)

On the Campaign Trail in MI, IN, NC, VA and OH This Week (link)
Donald Miller

From Reagan to Obama, a brief Political History (link)
Donald Miller

Endorsing Obama (link)
Doug Kmiec

My Support for Obama (link)
Mark Love

Why I'm Voting for Obama, and Why I Hope You Will Too (link)
Brian McLaren

Why I'm Voting for Obama (link)
Ryan Bolger

If you're a Christian planning to vote for Obama, tell us why...