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arguably also his lowest point = his lowest point is also arguable?
But lowest point =?

Powell has had a mixed and frustrating tenure as secretary of state, with his most memorable moment -- his 2003 speech to the United Nations making the case that Iraq possessed weapons of mass destruction that were later never found -- arguably also
his lowest point. The U.N. speech tarnished Powell's legacy, even though his personal popularity remains high -- both among the public and inside the State Department.

==
Set the course = set up the policy for action?

selling policies not popular =?

Context:

"The president ultimately set the course," Berger added. "Colin has had a hard hand to play over the last several years in selling policies not popular to allies."
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Hello Jobb

In addition to Komountain's reply:

1. 'arguably' also = 'it could be argued that', or 'some people would argue that'.

The word means very little, as anything can be 'argued'. Journalists like to use it, though; they imagine it gives an impression of great judiciousness.

('Arguably, the earth is flat'...'Arguably, the moon is made out of green cheese'...'Arguably, I could have used a better word than 'arguably', or even produced a decent argument to support my claims, but of course that would have involved a little more thought than I am prepared to give to this article, which I have to finish writing before lunchtime.')

2. 'his lowest point' refers to 'the lowest point in his career as Sec. of State', i.e. his worst professional moment.

3. 'Set the course' is a sailing metaphor. You set the course for a ship when you plan the direction in which it will proceed. (The 'ship of state' is a very old metaphor; it can be found for instance in the poems of Alcaeus, who lived 2700 years ago.)

4. "Colin has had a hard hand to play over the last several years in selling policies not popular to allies."

'Hard hand to play': from card-playing. 'Selling policies': from retail.

A curious combination.

MrP
Comments  
Other versions provided:

arguably: maybe; perhaps; though some may disagree

his lowest point: the most difficult times for him; the time when he was in his lowest spirit

set the course: decide what to do in the future; decide what path to take
('set up the policy' sounds awhward; 'set the policy' is better.)

selling policies: get other countries to accept the policies

policies not popular: policies (which are) not popular

I hope this will help you.
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 MrPedantic's reply was promoted to an answer.
Both of your replies were cool. I had a blackout in my area. I just now logged on to the net and posted this. Emotion: big smile