When did the parties switch platforms?

[Goldwater]

So, as we all know, the Democrats used to be the conservatives and the Republicans used to be the liberals.  So when did the parties switch? 

I can't tell if this is sarcasm or stupidity.

[Goldwater]

lmao "the parties never switched platforms"

Go on?

Red - States that voted majority R before 1964 and majority D since 1964
Blue - States that voted majority D before 1964 and majority R since 1964
Green - States that voted majority R both before and after 1964
Orange - States that voted majority D both before and after 1964
Yellow - States that voted for both parties equally before 1964 and majority R since 1964

This seems to imply (correctly) that either the parties or the states switched platforms sometime around 1964.

So you're saying that, for example, the 1988 Republican Party platform is the same as the 1940 Democratic Party platform, and vice versa? Because that's laughably ridiculous.