What would Sheila do?
Canadians think of themselves as followers of U.S. political trends. But as a matter of fact, there are Canadian precedents for Hillary Clinton's tenaciousness in the presidential race - especially as the lone, female candidate.
In 2003, recall, no one seemed to understand why Sheila Copps was staying in the Liberal leadership race, given Paul Martin's lock on victory.
In 2006, Liberal leadership candidate Martha Hall-Findlay hung on to the bitter end, even though it was clear she had no hopes of winning. She was the only woman in the race by the time the convention rolled around at the end of that year.
Perhaps Clinton might want to check in with Copps and Hall-Findlay for advice about whether to keep toughing it out - as the only woman, up against insurmountable odds.
The results here have been mixed.
Copps, as it turns out, wasn't rewarded for her persistence, having to wage a losing fight for her own Hamilton riding in the immediate aftermath of the 2003 leadership.
Hall-Findlay has fared a little better. Liberal leader Stéphane Dion appointed her as the candidate in Willowdale, which she won in a March by-election.