1) Obama uses the guilt by association fallacy. He says that because Bush who is a Republican apparently ruined the economy Romney will do the same because he is also a Republican.
2) Obama also uses pathos to give some emotional appeal to his audience by mentioning that it is his 20th anniversary with his wife. This will make the audience feel sympathy for him.
3) Romney had a structure through speech. For example: "Number 1...Number 2..." This makes the impression that he knows what he is talking about and has it well planned out. It also makes his argument easy to understand and follow.
4) Romney used rhetorical questions such as "well, why lower the rates?" Rhetorical questions allowed him to engage his audience in his speech.
5) Romney's tone of voice was confident throughout the whole speech. This helped him make his argument sound more credible and give a sense of trust to his audience.
6) Romney also uses Ethos to build on his credibility, he says that he knows how to better the economy because he has done it before.
7) Obama and Romney both use slippery slope. They both propose to their audience that if they choose the other terrible things will happen to this country.
8) Obama's hand gestures might help his argument by helping his audience visualize what he is trying to explain.
9) Obama does not make eye contact with Romney, when Romney is talking to him about plan for the economy. This makes Obama look weak and doubtful.
10) Romney uses analogy to make his point. Romney used the example of his five kids to compare it to Obama repeating the same thing over and over again about Romney's plan for the economy, which Romney keeps on denying is not the plan he is talking about.