Republican Dan Bishop Wins North Carolina Special Election

In a special election, North Carolina voters elected Republican Dan Bishop to represent the 9th district. Bishop, a lawyer known for the bathroom bill, was endorsed by the NRA. The district has been Republican since the 1960s. The election was called due to controversies over the previous vote, where allegations of illegal ballot handling led to a new election. Mark Harris, the previous winner, did not run again due to health issues. This election may indicate trends for the 2020 elections, though special elections have a mixed record in predicting outcomes.

What health condition did Mark Harris cite for not running in the special election?

How are special elections viewed in relation to regular elections?