In the 1980s, the Republicans were the first to make use of this innovation in political campaigns.
O Debates
O Direct-Mail
O TV ads
O The Internet

Direct-Mail

Explanation:

In the 1980s, The Republican party decided to run with Ronald Reagan as their presidential candidate. He's a former actor. Typically, he's really popular among the citizens who prefer to spend a lot of time staying at home and watch TV.

The direct-mail was intended to target these potential voters. The Republican party believe that they have higher preference to method of voting that does not require them to go out and spend a lot of time waiting at the booth.

answer; cardinal directions;

answer; opportunity cost;