The full US House of Representatives consists of 435 voting members. Currently there are 218 Republicans and 213 Democrats with four seats vacant.
So how should one describe the size of the Republican majority? The answer ‘five’ sounds reasonable since it is the difference between the numbers in the two parties. But many news articles, such as in this one, say it is ‘two’,
This is because if three Republicans decide to vote against their party on any issue and join with Democrats who all vote together, then the Republican party loses 215-216. So saying that the Republicans have a majority of two is shorthand for saying that the party can only afford two defections on an otherwise party line vote and still win.
It kind of makes sense but I don’t like it. If used that way, then a 218-216 or 218-217 margin would mean that they had no majority at all since they cannot afford even a single defection.