Voters in Democratic Republic of Congo go to the polls on Dec. 20 and international investors are keenly watching to see if a political shake-up occurs in one of the world's top suppliers of critical minerals. A win for President Felix Tshisekedi would likely mean a continuation of his goal to lure more foreign investment and renegotiate contracts to improve terms for Congo. Tshisekedi's opponents include mining magnate Moise Katumbi and former oil executive Martin Fayulu whose business backgrounds they both say will help them clean up Congo's corruption-plagued extractive industries if they win. MINES & MINERALS Congo is the...