Presidents are limited in what they can achieve by many things over which they have no control: the powers of the Congress and Supreme Court, history, competing interests of powerful lobby groups, the expectations of their party and supporters, the opposition of those who do not agree with their policy proposals, the actions of foreign countries, the strengths and weaknesses of their advisors and Cabinet secretaries, and their own human shortcomings. Campaigning is very diffcult, but governing is even harder.
Psalm 146 reminds us not to have unrealistic expectations for our leaders:
3 Do not put your trust in princes,
in mortal men, who cannot save.
4 When their spirit departs, they return to the ground;
on that very day their plans come to nothing.
5 Blessed is he whose help is the God of Jacob,
whose hope is in the LORD his God,
6 the Maker of heaven and earth,
the sea, and everything in them—
the LORD, who remains faithful forever.
7 He upholds the cause of the oppressed
and gives food to the hungry.
The LORD sets prisoners free,
8 the LORD gives sight to the blind,
the LORD lifts up those who are bowed down,
the LORD loves the righteous.
9 The LORD watches over the alien
and sustains the fatherless and the widow,
but he frustrates the ways of the wicked.
10 The LORD reigns forever,
your God, O Zion, for all generations.
Praise the LORD.