Wifes Credit Good, Mine Not So Much, Can We Upgrade to a New House?

Before we were married my wifes credit was such that she was able to buy her own home. My credit is fairly tainted to say the least. I am not on the deed of the house we currently "own". Will our credit now be evaluated collectively when we go to buy a new house? Are there ways around this? Can we buy based on her good credit or did me and my bad credit come together as a package? We are both gainfully employed. Thank you for your input.