ADATLANTA — In the final days before twin runoff elections Tuesday that will determine the trajectory of Congress for the next two years, more than a dozen civic engagement groups scattered across Georgia are making an aggressive push to mobilize Black voters, whose strong turnout in November helped Joe Biden win the state in the presidential race.They are up against historical winds, as runoffs here typically draw out a whiter pool of voters than regularly scheduled elections and have traditionally favored Republicans. Though most of the groups are officially nonpartisan, Black voters...…ADATLANTA — In the final days before twin runoff elections Tuesday that will determine the trajectory of Congress for the next two years, more than a dozen civic engagement groups scattered across Georgia are making an aggressive push to mobilize Black voters, whose strong turnout in November helped Joe Biden win the state in the presidential race.They are up against historical winds, as runoffs here typically draw out a whiter pool of voters than regularly scheduled elections and have traditionally favored Republicans. Though most of the groups are officially nonpartisan, Black voters...WW…