From First Read:

According to a top Brown campaign adviser, there are ”longer lines outside Boston than inside. Not good sign for Coakley. Scott’s voters highly motivated.”
A Democratic source says get-out-the-vote efforts have been good for Coakley, but adds, “I don’t know if the machine gets you 10 points.”

For what it’s worth, I wouldn’t overinterpret the 10 points figure as hand-tipping Coakley’s last-minute internals. The state of the art polling analyses had Coakley down between 6–10 points as late as last night. I’d bet the source is simply referring to these analyses.