Boston Globe said last year Kennedy wants to stay in the House for a while. Healey said she won't challenge Baker. Admittedly both are in a gubernatorial context, but if that extends to a Senate race then Moulton's the obvious Dem.
In Quebec Levesque tried to defeat Bourassa in the Bertrand by-election, he thumped PQ candidate (and future BQ MP) Francine Lalonde but narrowly lost in the GE despite the Gritnami. Earlier Lesage did not seek a seat in 1958-9 because the Unionists vowed to target him.