There’s cause for concern in Hillaryland, the constellation of Democratic advisers, supporters and politicians counting on the former secretary of state to lead the party to a sweeping victory next November.

Hillary Rodham Clinton’s nomination is almost a foregone conclusion, barring any unlikely legal or health issues. Democrats will offer a more coherent and unified front for the general election than the fractious Republicans.

Still, this optimism is based on the presumed weakness of the opposition, and ignores what polling suggests could be the candidate’s own vulnerabilities.

The worries of some Clinton insiders are focused on the general election. There is an “enthusiasm gap.” Surveys of voters at this early stage of the campaign show that young people, independents, possibly even blacks and Hispanics are not excited about her candidacy.