Sadie used to stay home all day with my ex-bf. I was the queen when I came home (it helped that he wasn't that into dogs when I first got her... still isn't but loves, loves, loves her). Riley met him after we'd broken up. We were together for years, and we're still friends.
When he drops by to see me or go out or whatnot, Sadie and Riley act like he hung the moon. But, you know what? They do that when I come home, too. Actually, if he's been around them and I've been gone, when I come home, it's "Mom! Mom! Mom!" You can't beat a lab's excitement to see her people, though.
I think it just has to do with the fact that they don't see him as much more than a favoring thing. They may follow one of you more than the other depending on who they view as alpha, but I would guess you may be seen as more alpha than your husband, b/c you are around all day. When Sadie was with my ex all day, she definitely saw him as more alpha. She still does, I think.