Let's see, we have Walker, Huckabee, Santorum, and Cruz all competing for the Iowa Pub evangelical vote (with Carson and Jindal out there somewhere, and maybe Perry reading up on his Bible). Sounds good to me! 
Why does that sound good to you? Because of a vote split? Last time, with days left before voting, Perry, Bachmann, Santorum and Gingrich were all about tied in Iowa polling, pretty far behind Romney and Paul. So Cons are fairly likely to rally disproportionately to one choice. The other effect of an abundance of religious candidates- including not just these but also Rubio, Kasich, Paul, even Bush who is wooing them- is it creates a race to be as socially conservative as possible. I also wouldn't say the Iowa winner is an unlikely nominee. Huckabee and Santorum were at huge financial disadvantages, but W and Dole were not.
