Congress.org has compiled its Power Rankings. Let's take a look at where King stands. The methodology for the rankings are based on position, influence and legislative activity.
According to the listing, King is ranked # 66 out of 232 republicans for power.
In the full House, King drops to #83.
In the New York congessional delegation, King is #7 out of 29. He is behind Democrat Charlie Rangel at #3 and Democrat Nita Lowey at #6.
Of course this ranking is probably changed since #1 Tom Reynolds is involved in the Foley cover-up.
The breakdown for King shows the majority of his "power" score comes from being Chairman of the Homeland Security Commitee. Of a possible 75 points, 39 comes from his chairmanship while only 1 point for influence and 2 points for legislation.
King is fairly weak on influence and legislation. Without his chairmanship, his power ranking would be much, much further down the list.