That's really the only question that you have to ask yourself. It's not about abortion or healthcare or any of the other ancillary issues that we currently face, though these are all important. It's about the ongoing war that is being waged on our civilization. It's about Iran obtaining nukes, it's about the security of Pakistani nukes. It's about radical Islam and its commitment to the destruction of western civilization. It's about our survival and who you trust with that survival. All else is secondary.
Remember how your priorities were reordered on 9/11, and how what was truly important achieved a clarity heretofore unknown to you? In the past 6 1/2 years, much of that clarity has been replaced with a murky preoccupation with the narcissistic navel-gazing to which successful and prosperous societies such as ours are subject. Many of us want to tell ourselves that such a thing simply cannot happen again and have chosen to throw that day and the painful feelings that accompanied it down the memory hole. Do so at your own risk.
Call me a panic monger if you wish, but if the unthinkable does happen I hope that you will have chosen an individual who has the capacity and the will to do what it takes to defend and save our civilization. I hope that on your personal list of issues that "survival" has a prominent place, for without survival all else is worthless fantasy. Think carefully and choose wisely.