@techreport{NBERw13637,
 title = "Momentum and Social Learning in Presidential Primaries",
 author = "Brian Knight and Nathan Schiff",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "13637",
 year = "2007",
 month = "November",
 URL = "http://www.nber.org/papers/w13637",
}