Start with a falloff in Latino support. Latinos are philosophically heterodox, and are particularly critical in Florida, Arizona, and North Carolina—the states where Biden’s lead is narrow. That Trump is polling slightly higher among Hispanics than he performed in the 2016 exit polls is cause for concern.

In Florida, Cuban-Americans scarred by the legacy of Fidel Castro respond to charges that Biden is a “socialist.” There, and elsewhere, culturally conservative Hispanics may respond to Trump’s pro-life stance, and his castigation of Democrats as the party of civil disorder. Reflecting the gender gap among our populace at large, Trump’s version of hyper-masculinity resonates among a cohort of traditional males.

Moreover, the Biden campaign was tardy in its organizing efforts among Hispanics. Belatedly, they are advocating and advertising far more intensely, highlighting Biden’s proposals for immigration reform and the toll of COVID-19 in the Hispanic community. But the states where Latinos matter most are those where Biden has the least margin for error.

Another unsettling indicium is a distinct GOP advantage in new registrations among white, non-college-educated voters in Pennsylvania, Wisconsin, and Michigan.