With both Leadership candidates that have dropped out supporting him, I'm convinced now, more than ever, that Mulcair stands a reasonable change of winning on the 1st ballot.
I wouldn't go that far this is still a 7 candidate field there's little precedent for a candidate winning on the first ballot in a field that crowded (with many excellent candidates).
If Mulcair does win though (on whatever ballot) I think a lot of us will look back on today as the tipping point.