It is often the case among mainline protestants to talk about Jesus as either our Lord or our Savior. It is my experience that the phrase "Jesus Christ our Lord and Savior" is generally reserved for the more conservative types, But let us be clear here, Jesus is both Lord and Savior for the Christian - and both are important.
When I say Jesus is my Savior what I mean is that it is Jesus who saves me from my destructive self. Jesus is the one who teaches me how to have life and how to have life abundantly.
When I say Jesus is my Lord what I mean is that there are other lords that I can choose to be the authority in my life. For some it is a particular political thought, for others it might be a social status. But if Jesus is Lord then that means that the other lords in the world are not my Lord.
If we proclaim Jesus as Lord and Savior then several things begin to happen. We might begin to see that the values of the American Dream conflict with the values of the Kingdom of God. We are saved from the destructive path of the American Dream (Jesus is Savior) and where there is conflicting values, we are faithful to the Kingdom of God not the American Dream (Jesus is Lord).
For instance, the American Dream values the individual and undervalues the work of the community/group/tribe/family the individual comes from. There are many situations that no matter how hard someone works alone, they just will not get very far. If you are a prisoner released from jail then you will have a very hard time moving up in the world without a very large and strong support network - regardless of how hard you work!
Jesus is Lord and Savior because not only does Jesus help us discover the resurrection but Jesus also has say over our current moments. We fail to be a faithful church when we think of Jesus as primary Lord or primarily savior.