Differences in parenting styles creating strain? My husband is a push-over for our toddler...and in general?

I don't really have an answer for your problem. I could suggest that maybe you talk with him about how he lets her get away with things and ask him to try to be more firm with her. Maybe you could do the opposite and not be as firm? Maybe come together? I'm sure he will be doing more changing than you, but it isn't good for you to be complete opposite styles in parenting. This will cause major trouble.