I always propose this exercise for anyone who has either switched parties or is frequently taking the side of the opposite party to theirs, and yet blames it on how their party has changed and lost them.

I say, "Go back and read the platform in the year 2000 for your party. If you mostly agree with it, yet you can't agree with that same party today, then the party changed on you. If you mostly disagree with it, then it was mostly you who changed."

Most people refuse to go do this, because they don't want to accept the truth that they changed, rather than their party's ideology.

I will say that Democrats have changed more since 2000 than Republicans, ideology-wise. Republicans have mainly changed in Demographics, as they have become more working class and rural in their appeal, and that has made up for losses in the upper and upper-middle class demographic.