According to Len Goodman on the 'Dancing With the Stars' (Tue., 9PM ET on ABC) results show for this third week, "My expectations were that these two couples would be fighting for the final and maybe one of them going home with the Mirror Ball." He was talking about the two couples left standing in threat of elimination.
That said, though, neither of them had the highest scores on the previous night, though they also didn't have the lowest scores either. What they clearly had was not a large enough fan base. Or maybe, as Tom Bergeron suggested, everyone just assumed they were safe.