The Wall Street Journal reports that McConnell personally delivered a pitch during a Nov. 6 fundraiser with officials from BAE Systems Inc.
A source from that fundraiser told the Wall Street Journal that McConnell specifically warned against funding Republican primary opponents.
"The main message he was pushing was: Get involved, mainly to teach those who are primarying incumbents that it is not helpful to run against incumbents who are champions for the industry," the source said.
Meanwhile, a new poll today from the Democratic firm Public Policy Polling shows McConnell within only one percentage point of his Democratic rival, Alison Lundergan Grimes, 43 percent to 42 percent -- a statistical dead heat. The poll also showed that more than 60 percent of Kentucky voters disapprove of the minority leader's job performance.