Final answer:
Politicians pay more attention to middle and upper-class voters because they vote at higher rates, political parties favor them, and many politicians themselves are from these classes.
Step-by-step explanation:
The disproportionate amount of attention politicians pay to members of the middle and upper classes may be attributed to the fact that these voters go to the polls at substantially higher rates than members of other classes, political parties have shown a strong bias toward them in the past, and most politicians themselves are members of these classes.