What’s in a name? A lot, the National Republican Congressional Committee obviously believes. Last week, the committee sent a letter demanding that a TV station stop running an ad declaring that the House Republican budget plan would “end Medicare.” This, the letter insisted, was a false claim: the plan would simply install a “new, sustainable version of Medicare.”

But Comcast, the station’s owner, rejected the demand — and rightly so. For Republicans are indeed seeking to dismantle Medicare as we know it, replacing it with a much worse program.

I’m seeing many attempts to shout down anyone making this obvious point, and not just from Republican politicians. For some reason, many commentators seem to believe that accurately describing what the G.O.P. is actually proposing amounts to demagoguery. But there’s nothing demagogic about telling the truth.

Start with the claim that the G.O.P. plan simply reforms Medicare rather than ending it. I’ll just quote the blogger Duncan Black, who summarizes this as saying that “when we replace the Marines with a pizza, we’ll call the pizza the Marines.” The point is that you can name the new program Medicare, but it’s an entirely different program — call it Vouchercare — that would offer nothing like the coverage that the elderly now receive. (Republicans get huffy when you call their plan a voucher scheme, but that’s exactly what it is.)