What will be seen as Obama's biggest failing in posterity?

[Blue3]

Being unable to get his chosen successor in office
He did all he could

Collapse of the Democratic Party at a state level
Could have done more, but not even mostly his fault, when he campaigned for other Democrats they usually did poorly

Inability to reach catharsis in regards to the public's demand for punishment of Wall Street
He passed financial reform, and it's a good thing he didn't go all populist and tell people to gather their pitchforks and torches

Rising disillusionment with political system  
It was there before him, in fact Obama came to fame by trying to fight it in his 2004 speech
 
Sluggish post-crash growth
Not his fault, and it was pretty good we grew at all and didn't have another depression

Continued racial tension
This is what you get when a country that still has a lot of racists gets a black president

Inability to pass key trade deals with Pacific countries and EU
Not many really care about this

Inability to ride with rising economic inequality
Not sure what this means? Most of his proposals couldn't make it through a GOP Congress

Failure to pass a healthcare reform with lasting, strong public support
Yeah, they failed in the PR of this for the most part

Failure to pass immigration reform
See GOP Congress, but he does have some responsibility for not fully taking advantage of those first 2 years

Failure to pass gun control
See GOP Congress, but he does have some responsibility for not fully taking advantage of those first 2 years

Failure to pass comprehensive climate change legislation  
See GOP Congress, but he does have some responsibility for not fully taking advantage of those first 2 years... and he WAS able to accomplish a lot with executive orders

Collapse of Sunni Awakening, and subsequent rise of ISIS, fall of Mosul
Not really America's fault, and I think ISIS will be a short-term blip anyways

Being moribund in Syria  
Yeah, this was a failing

Unable to deal with a more aggressive Russia
We enacted crippling sanctions against them... he was perfectly "able to deal" with them. But "dealing" anymore with them would mean war.

Failure to follow through on Libyan mission
We were never meant to be even the leader of the humanitarian intervention. Libyans made that mess, they should clean it up. Maybe doing a little more would have prevented Benghazi and that whole fiasco, but really I don't think it was our responsibility. It's not like Iraq, which we broke.

Inability to install successor to Scalia
Did all he could