Hi guys I'm new here and want to understand English as the natives so I'll have a lot of questions to ask here ...
I have here some doubts in the next phrases ...
What is "grounded" here?
Is "Questioned whether" means he was wondering?
I have no idea what is "nibbling around the edges"
"his spouse had her own career in the city; her mother lived nearby; the girls were happy,
grounded, in a wonderful school. But Obama missed them all terribly and
questioned whether the separation was worth it when all he seemed to be doing in the Senate was
nibbling around the edges."