Unvaccinated Americans’ concern about the new omicron variant plunged at the end of December despite rising Covid-19 cases and hospitalizations that leave them most at risk, a new Morning Consult poll finds, as Americans broadly aren’t growing more concerned about the new variant or changing their lifestyles despite cases reaching record levels. Concern about omicron among the unvaccinated dropped from 52% to 44% between December 24 and 30, the Morning Consult poll found, which was conducted among 2,220 U.S. adults. Concern levels held steady among the vaccinated (going from 80% to 79%), while concern among all respondents went down from...