There is a plan in place to expand the College Football Playoff from four teams to 12. It’s a remarkable change for a sport that for decades seemed committed to using any other way possible to determine a national champion than a playoff. How did college football get here? On the latest AP Top 25 College Football Podcast, Ivan Maisel, formerly of ESPN and about to become the lead writer of a new college football website called on3.com, joins the AP’s Ralph D. Russo. They look back at what led to college football embracing a playoff structure and how it has gone so quickly from two teams to four to 12. Plus what questions remain to be answered about this new plan, including how soon can it be implemented.