Can conservatives be progressive?

It seems that a short time ago there were two major political philosophies.  A person was identified as either a conservative or a liberal.  Now it seems that a third designator has entered the political scene.  It is the title, “progressive.”  Some commentators will say that progressive is just a new name for liberal.  But others say that progressive means neither conservative or liberal, it is something distinct and different.  But there does not seem to be consensus about what that distinct difference is!  What is the answer?  Must a person be a political liberal to be progressive?  Or can conservatives also be progressive?