The South is a conservative area where the GOP would win - In Blue or Purple states, Sanders is ahead. Idaho, Utah are so small delegate wise they don't make a huge difference.
People who are not stupid would agree with that assessment - People here are not the sharpest so there you go.
I believe the democratic party is banking on Texas going purple with it's changing demographic. Virginia would of been consisted lost a couple election cycles ago at going blue. And Obama won a couple southern states in his time. So in the past I would have agreed with you but now I think it does matter.