Looks like they are still using landlines as part of their method:
To reach those who have abandoned traditional landline telephones, Rasmussen Reports uses an online survey tool to interview randomly selected participants from a demographically diverse panel.
They claim to offset this with various corrections, but it seems landlines are the only numbers they call.
They used to call landlines, which most polling outlets gave up since that will always tilt the results older/conservative.
Not sure if that’s still their process, but with the wide gap here, i’m betting it is.
I highly doubt they’d be crappy enough to keep that up. Nobody does polls like that now
Looks like they are still using landlines as part of their method:
They claim to offset this with various corrections, but it seems landlines are the only numbers they call.
Very much still in use.