Reviewing Biden's (and Democrats') numbers after a turbulent first year.KEY POINTS FROM THIS ARTICLE— As Joe Biden marks a year in office, he has found himself in a perilous position, and there are no obvious signs of improvement.— Among Biden’s challenges is an apparently weakened position among nonwhite voters as well as younger voters, two immensely important pillars of the Democratic coalition.— Inflation has re-emerged as an important problem for what appears to be the first time in decades, and Biden has work to do to persuade the public that he’s taking it seriously.