Hillary Clinton and Bernie Sanders rally together in New Hampshire

Supporters of Democratic presidential candidate Hillary Clinton sing the national anthem in Portsmouth, N.H., before a rally with Democratic presidential candidates Clinton and Sen. Bernie Sanders.

Supporters for Democratic presidential candidates Hillary Clinton and Sen. Bernie Sanders cheer before a rally in Portsmouth, N.H.

Supporters of Democratic presidential candidate Hillary Clinton sing the national anthem in Portsmouth, N.H., before a rally with Democratic presidential candidates Clinton and Sen. Bernie Sanders.

Supporters cheer before Democratic presidential candidate Hillary Clinton appears at an event with Sen. Bernie Sanders at Portsmouth High School in Portsmouth, N.H.

Cerys Coffey, 5, of Northampton, Mass., wears a dress supporting Democratic presidential candidate Hillary Clinton as she waits in line to enter an event with Clinton and former Democratic presidential candidate Bernie Sanders in Portsmouth, N.H.

People hold signs outside an event where Bernie Sanders appeared with Hillary Clinton in Portsmouth, N.H.