Before the less-binding Iowa caucus first received national attention in the 1970s, the New Hampshire primary was the first binding indication of which presidential candidate would receive the party nomination. In defense of their primary, voters of New Hampshire have tended to downplay the importance of the Iowa caucus. "The people of Iowa pick corn, the people of New Hampshire pick presidents," said then-Governor John H. Sununu in 1988.
Since then, the primary has been considered an early measurement of the national attitude toward the candidates for nomination. Unlike a caucus, the primary measures the number of votes each candidate received directly, rather than through precinct delegates. The fact that the primary is based on the popular vote means that it gives less well known candidates a chance to pull ahead. Unlike most other states, New Hampshire permits independents, not just registered party members, to vote in a party's primary.