I found:
Currently the opposing camps are duking it out in the journals. (See the September 2002 Journal of Comparative Psychology for the latest irruption.) I won't say the prosynchrony crowd is out of the game, but right now it's
third and long.
(Full context if you need it: [url="http://www.straightdope.com/columns/021220.html"]The Straight Dope[/url]. -- And don't ask how I stumbled over this specific page [;)] ) After a google search I assume it means "prosynchrony crowd is losing ground and will need effort to gain it back".
My questions are:
1. Did I get the meaning right?
2. Does this idiom come from American Football or are there other sources?
3. Is it only rarely used? (Google has only 19,400 hits opposing over 300,000 for "losing ground")
cu