Final answer:
Charismatic leaders are often the driving force in Ideological parties, which focus on specific issues or causes and occasionally influence election outcomes within a predominantly two-party system.
Step-by-step explanation:
In which type of minor party are charismatic leaders often the driving force? The answer is Ideological parties. These parties tend to rally around either a singular cause or a set of specific, sometimes controversial, issues. Charismatic leaders within these parties can play a key role in galvanizing support and driving the party's agenda forward. Despite the minor party's occasional influence, the U.S. political landscape has been dominated by a two-party system, consisting of the Republicans and Democrats. Historical examples like the Progressive Party illustrate the impact minor parties can have, such as swaying the outcome of elections, though they seldom succeed long-term without broad electorate support. Over time, major parties may absorb issues that were originally championed by third parties, incorporating them into their platform.
In single-issue parties, charismatic leaders are often the driving force. These parties revolve around advocating for specific controversial issues or promoting relative extreme ideological positions. Their narrow focus on a specific cause or set of causes can attract charismatic leaders who are passionate about championing those issues.