Georgia Sen. Johnny Isakson Is Resigning. Stacey Abrams Says She’s Not Running.

Georgia Sen. Johnny Isakson, who has been suffering from Parkinson’s disease, a fall that hospitalized him in July, and kidney surgery, announced Wednesday that he would resign from the Senate at the end of the year.

Isakson’s decision could have a profound effect on the 2020 Senate map. Under Georgia law, Gov. Brian Kemp will name a replacement for the seat until a special election is held on the next regularly scheduled, statewide general Election Day. That means that in November 2020, Georgia will have two senate elections: One for...