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Chapter 9


Credibility is arguably the most important factor in gaining an audience’s adherence to an argument, because decision makers often make up their minds about an argument before it even begins. Even when this is not the case, it can be difficult to sway a decision maker who has already granted credibility to the opposing side in an argument. Homophily especially is a difficult barrier to breach, as most people are reluctant to grant adherence to an argument from someone they see as different from themselves, even if they believe that argument to be more compelling. This is an issue commonly seen in politics, as people who are staunch supporters of a certain political party or candidate will be more willing to accept arguments from people that share their political views. This is why the consensus of who was the “winner” of a political debate is often unclear, as decision makers will say that either candidate was the winner depending on which one shares their partisan views. Staying on the topic of politics, secondary credibility is a commonly used strategy in political advertisements and debates, because decision makers are likely to hold the opinion of current and previous figureheads from their party in high regard. An example of this is Floridian Gubernatorial candidate Andrew Gillum’s ad campaign that has former President Barack Obama advocating in favor of Gillum for governor. This ad campaign relies on the secondary credibility of President Obama, as it believes that decision makers will be more likely to agree with Gillum’s case for governor due to the credibility that Obama has as a former president.

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