I don’t pretend to know the parameters of God’s timetable for judging a nation, but after reading Genesis and Exodus recently I do know he holds the Kings of the earth in His power. He keeps them and hardens them as He wills. I don’t even know that we can say we’ve been judged with Obama, as man is always under judgment before God due to the Fall. We’ve had it pretty good for several decades, historically.
I KNOW this: GOD is slow to anger, abounding in steadfast love and compassion! When the bow breaks, remember this and call on Him through Jesus.
Obama can be a warning or a judgment, depending on how we react towards God.