Elections: What happens when a runoff election is called?

AUSTIN (KXAN) — Several well-known politicians were sent packing Tuesday, after the Texas primaries.
The Republican race for attorney general is perhaps the best example of that happening, but a May runoff means it's not over yet. Click here for the latest election results
Three candidates for the attorney general spot were already in statewide elected positions, as well as a congressman.
A Republican runoff could be stressful news for incumbent Ken Paxton.
Instead of spending many months