I'm not necessarily disagreeing, but “fire in the belly” is virtually a requirement to become president, and it's awfully hard to distinguish that from having a big ego and a will to power.
The job description of Romans 13 for civil magistrates may overlap with the qualifications of I Timothy and Titus for ecclesiastical office, but they are not identical.
Being a civil magistrate is a calling, not totally unlike being a pastor, elder or deacon, but the skills required are very different. Yes, bravery and firm convictions are required in church and in state, but wielding the sword of civil justice is not the same as wielding the sword of the Scriptures from the pulpit. Servant leadership is an asset in the church but often perceived as weakness by the world -- look at all the attacks leveled against Huckabee and Santorum on Free Republic for “weakness.” I'm not saying those attacks were justified, but I am saying there was a perception of weakness -- and I'm saying that as a person who voted for both Huckabee and Santorum.
If the worst problem with a candidate is a big ego and a desire for power, that doesn't bother me in politics, though I'd have a big problem with someone like that in the pastorate. Oh, I forgot... we've already got a lot of men like that in too many “big steeple” churches ;-)
Criteria:
Exodus 18:21
Moreover thou shalt provide out of all the people able men, such as fear God, men of truth, hating covetousness; and place such over them, to be rulers of thousands, and rulers of hundreds, rulers of fifties, and rulers of tens:
Notwithstanding kingly zeal not for one's own power, prerogative and discretion but for God's law:
Psalm 119:139
My zeal hath consumed me, because mine enemies have forgotten thy words.
But the man of authority should wield his authority under authority.
Matthew 8:9
For I am a man under authority, having soldiers under me: and I say to this man, Go, and he goeth; and to another, Come, and he cometh; and to my servant, Do this, and he doeth it.
God allows all kind of tyranny to work his holy will but he is jealous of his glory:
Acts 12
21 And upon a set day Herod, arrayed in royal apparel, sat upon his throne, and made an oration unto them.
22 And the people gave a shout, saying, It is the voice of a god, and not of a man.
23 And immediately the angel of the Lord smote him, because he gave not God the glory: and he was eaten of worms, and gave up the ghost.
Because I like Newt, I would not want to give him any more temptation in his life. He has been an unfaithful servant. You would not draft a person eaten up with cancer to champion your team in the NFL.
Luke 19:17
And he said unto him, Well, thou good servant: because thou hast been faithful in a very little, have thou authority over ten cities.