A person who flattens any meaningful discussion about an event by constantly relating it back to a
single issue, e.g. income inequality, immigration, race, "Christian
values," feminism, etc.
The debate moderator was asking questions about foreign policy, but Bernie
Sanders just kept bringing it back to income inequality. He's a total steamtroller.
Grandma turns into a steamtroller once she starts
talking about immigrants at
Thanksgiving.