Democrat Roy Cooper expected to run for Senate from North Carolina, sources tell CNN

As a social scientist focusing on key performance metrics of the United States, I would select voter turnout as the most appropriate metric for this article. Voter turnout is a crucial indicator of civic engagement and democratic participation, which can have far-reaching effects on policy-making and governance.

Speculation on how this information might affect voter turnout:

The entry of Roy Cooper, a popular and experienced politician, into the North Carolina Senate race could potentially increase voter turnout in the state. Cooper's track record of winning elections, even in years when Republicans carried the state in presidential elections, suggests he has broad appeal. This could motivate both Democratic and moderate voters to participate in the election, potentially increasing overall turnout.

Entities mentioned and their perceived motivations:

1. Roy Cooper: Former North Carolina Governor - Motivation: To continue his political career at the federal level and potentially flip a Republican Senate seat for the Democrats.

2. Democrats: Political party - Motivation: To gain control of the Senate seat and strengthen their position in Congress.

3. Republicans: Political party - Motivation: To retain the Senate seat and maintain their influence in Congress.

4. Thom Tillis: Outgoing Republican Senator - Motivation: To avoid potential conflict with Trump supporters and preserve his political legacy.

5. Donald Trump: Former President - Motivation: To maintain influence over the Republican party and support candidates aligned with his views.

6. Morgan Jackson: Cooper's political adviser - Motivation: To manage Cooper's political strategy and public image.

7. Wiley Nickel: Former Democratic congressman - Motivation: To advance his political career by running for the Senate seat.

8. Lara Trump: Potential Republican candidate - Motivation: To leverage her family name and connections to enter politics and potentially win the Senate seat.

9. Kamala Harris: Vice President - Motivation: Previously considered Cooper as a potential running mate, indicating an interest in his political abilities.

10. CNN (and the article's author): News organization - Motivation: To report on political developments and provide analysis of the upcoming Senate race.