If campaign fund-raising prowess is an indicator, the two most closely watched 2020 congressional races in Georgia are shaping up as highly competitive. First-term Democrat Lucy McBath is outpacing her potential Republican challengers in the battle for campaign donors in the 6th Congressional District. Meanwhile, the open 7th District seat has attracted 18 candidates, with 11 having raised more than $100,000 each through the end of last month, according to reports filed with the Federal Election…