Watching the American Experience episode on Clinton (available online) reminded me how current craziness began during the Clinton years with the Contract With America generation, culminating with impeachment.
In ‘98, the country had had enough of them, and the GOP started unraveling with a major midterm defeat.
My theory is that the trend would have continued, but 9/11 and the county’s shock, grief, and fear gave them 5 extra years.