Sterilize jars and lids. Combine cranberries and sugar in a 6-quart saucepan. Bring to a FULL, rolling boil over high heat, stirring occasionally. Stir in pectin.
Return to a FULL, rolling boil. Boil for 1 minute, stirring constantly. Remove from heat and skim off any foam. Fill jars. Wipe jar rims and cover with lids. Invert for 5 minutes, then turn upright. Let cool completely at room temperature. Check lids for proper seal. Makes 2 pints.