> A position that was considered conservative in the 1980's is likely not conservative a generation and a half later.

If you want a really jarring example of this, watch Bush (Sr.) and Reagan debate immigration during the 1980 primaries. https://www.youtube.com/watch?v=YsmgPp_nlok

They sound like Democrats today. (And that's in the primaries, where people tend to be more party-line!)