Final answer:
Bob Woodward and Carl Bernstein were the Washington Post reporters who first covered the Watergate break-in, and through persistent investigative journalism, they played a key role in bringing the scandal to the public's attention.
Step-by-step explanation:
The two reporters from the Washington Post who delivered the first stories of the break-in at the Democratic National Committee headquarters at the Watergate office complex were Bob Woodward and Carl Bernstein. Their reporting on the incident initially did not have a massive impact as the press was focused on other events, however, Woodward and Bernstein persisted in their investigative journalism. They received crucial information from several anonymous sources, including an informant known as "Deep Throat" - later revealed to be Mark Felt, the FBI's associate director at the time. Their determination and continuous publication of their findings kept the public's attention on the scandal, contributing significantly to the eventual resignation of President Richard Nixon and indictment of numerous government officials. This historical event represents a classic example of watchdog journalism.