Democrats’ hopes of capturing statewide office in Georgia may have been dashed in 2018, but this year the party appears on the cusp of a breakthrough. The state’s two Republican senators are facing increasingly competitive reelection bids, and President Trump’s poll numbers are suffering there as he scrambles to get a handle on the coronavirus pandemic and respond to ongoing civil unrest over racial injustice and police brutality. Democrats, meanwhile, say that changing demographics in Georgia have made the state ripe for political change. Some 322,000 new voters joined the state’s rolls last year, including many young voters and people...