Each of the candidates in this year' s mayoral election is a small-business owner  Most small-business owners are competent managers  Moreover, no competent manager lacks the skills necessary to be a good mayor
So, most of the candidates in this year' s mayoral election have the skills necessary to be a good mayor
Anyone who has worked in sales at this company has done so for at least a year. Most of this company's management has worked in its sales department. So, since no one who has worked in the sales department for more than a year fails to understand marketing, most of this company's upper management understands marketing.