When creating vote targets, how does a campaign calculate an estimate of the persuadable vote? a. Subtract the total of the number of votes a "bad" candidate from their party received in an election when their party performed the worst from the total number of votes a "good" candidate won at the party's high point. b. multiply the percentage of the votes that are undecided in your most recent poll by expected turnout c. calculate the number of expected voters in counties or wards that voted Democratic in one election and Republican in another d. Utilize public opinion polls to ask respondents their vote choice