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

Still, this optimism is based on the weakness of the opposition, and ignores the candidate's own glaring vulnerabilities.