1. Howard Zinn
2. Growth of female attendance in college and university.
3. Growth in humanities, arts student enrollment in colleges and universities.
4. Late night entertainment television hosts.
5. The small number of news and network wire services which feed the thousands of news outlets, all of which are leftist, plus the default news outlets that come up in the web browser. The Huffington Post, Yahoo, MSN, all of which putting forth original leftist news and hundreds of secondary leftist analysts and follow-upers.
Good list, especially:
5. The small number of news and network wire services which feed the thousands of news outlets.
What they do is pollute the minds reading every newspaper in the country.