There are different methods through which leaders have risen to power throughtout history. But despite these different methods, there is only one source through which a leader can come to power. No leader, political or otherewise, can come to power except through the soverign will of God. Even secular rulers, according to the bible, came to power through God, as the book of Romans 13:1 tells us.

God raises up good leaders to bless righteous people and bad leaders to punish the wicked. The is evident in Psalm 125:3 (NIV) where it says, "The secpter of the wicked will not remain over the land allotted to the righteous, for then the righteous might use their hands to do evil."  If this is so, and it is, then logically if a leader is wicked they can only rule over a land inhabited by a wicked majority. Under such leaders the righteous are usually a small minority. However, when a nation is righteous or God intends to make it righteous, He raises up righteous leaders to lead. The book of Judges in the blible gives us outstanding historical examples of these principles. 

Since this is so, one cannot dispose a leader, good or bad, until God's purpose is fulfilled and God is ready to replace them. Both kinds of leaders manifest two aspects of God nature: His nature to bless the righetous and His nature to punish the wicked. Since God is the ultimate leader, every leader is a deligate of God. Woe to the leader who does not recognize this, for God will call them into account at the proper time.

Those who live in a democratic country and think that their votes are the final factor should think again, because they are greatly misguided. God is the final decider as Psalm 75:5 - 7 (NIV) states, "Do no lift your horns against heaven; do not speak with outstretch neck. No one from the East or the West or from the desert can exalt a man. But it is God who judges: He brings one down, He exalts another."