Barack Obama has praised Raphael Warnock following his election victory as Georgia’s next US senator.The Democrat and pastor defeated Republican incumbent Kelly Loeffler to become the first Black senator in the state’s history.It means the Democrats are now one step closer to controlling the Senate following the victory, with fellow Democrat Jon Ossoff’s also tipped for victory.Two Senate seats were up for grabs in special run-offs, with overall control of the chamber for the next two years