What are the possible ramifications to modern conservatism in general and the Republican party in general of this treatment?
Let's assume the poll accurately reflects the opinions of the FR membership. This is not necessarily a safe assumption to make, as polls are open to manipulation. However, let's assume that the computer code for the poll has some reasonable protections against such manipulation.
This imples one out of every three freepers opposes the teaching of "intelligent design" in science class.
Let's make another assumption. Let's assume that FreeRepublic is a broad cross-section of the conservative moment and therefore is an approximation of the views of those people who tend to vote Republican. This is also not necessarily a safe assumption. It is my sense (though I have no firm data) that FR is more conservative than Republican-leaning swing voters, and even somewhat more conservative than registered Republicans taken as a whole. This would tend to skew the results against the supporters of "intelligent design" but I am not going to go with this assumption.
Assuming that FreeRepublic is a moderately accurate sample of potential Republican voters, I ask what are the potential ramifications of referring to those people who oppose the teaching of creationism or intelligent design in science classes in secondary public schools as a competing scientific theory to evolution as nazis, commies, terrorists, atheists, idolaters, liars, cowards, and homosexuals, if those people represent fully one third of the Republican base?
Your question answers itself.
I will give them the benefit of the doubt and just note that the people who throw those epithets are a small percentage of FReepers who don't understand TToE.
But your point is well-made.