In 1988, the Republican Party was still fairly moderate and centrist - most Americans identified as Republicans, and while yes, the Reagan Revolution was taking hold, the party's conservative wing didn't really begin to take full control for a few years.
Whereas the Democrats, for much of the seventies and eighties, had been much farther left than we could probably imagine today. Clinton was pretty important to moving them more center while the Republican Revolution in 1994 moved Republicans further right.
I'm aware of what went on back then.
I was ridiculing his notion that Dukakis was a fringe-leftist, and his assertion that Obama would have been a Republican "just because."