It has always seemed to me that Original Sin depends on a gross misreading of the Adam and Eve story. I see that as a story intended to explain what distinguishes humans from other animals. The "sin" bit is just there as a part of the plot.
My experience with preachers, is that they illustrate their sermons with many metaphors, and sometimes use exaggerated rhetoric when presenting those metaphors. And it seems to me that is about what Paul was doing in that oft quoted Romans 5 section.
In summary, no I do not find any biblical support for "original sin".