Single moms and dads and dating

I met someone who was a single dad with two great kids.  He loved his kids more than anything.  He told me he would not date anyone who didn’t have kids because someone without kids would not understand his devotion he would have to have to his kids first.  He felt the kids would come first and his mate second.  I told him not to limit his choices as there may be someone out there who may not be able to have kids but would be a great mom.  So what do you think?  If you have kids, would you date someone without kids too?  If you don’t have kids, would you date someone with kids?  This is a big issue for single people who are dating.