...OK but Hillary was a prominent and influential figure in the Democratic Party, not a a backbencher Congresswoman not even from the continental US who has no fundraising apparatus, refused to initially endorse her party's nominee at first and hadn't even expressed interest in running anyway.
That's not what the term means in the US since it would render it useless. A backbencher in the US typically means not in a leadership role of a prominent leader of any caucus or faction.
I mean it is though, and has been for a while.
