1. President Obama in the debt-ceiling negotiations offered the Republicans a Grand Bargain that would cut Social Security and Medicare benefits. This is bad policy in itself and bad politics for the Democrats. These programs are essential for the vast majority of Americans and are very popular because of that. It would be remarkable in the extreme if Obama weren't getting sharp criticism over that.
2. Obama's "triangulation" politics, especially since the 2010 election, has involved defining himself as a centrist by emphasizing his differences with Democratic liberals. In speech after speech, he's highlighted how members "of my own Party" differ with him over policies. Already in 2009, Obama's then Chief of Staff Rahm Emmanuel was calling liberal activists "f*****g retarded" for trying to put pressure on Blue Dog Democrats, pressure meant to bolster Obama's ostensible position on the health care reform. Later, Rahm apologized to the disabled for using the word "retarded." No apologies to Democratic progressives were forthcoming.

[There] is a common strategy of asking any person of color who identifies a racist practice or pattern to "prove" that racism is indeed the causal factor. This is typically demanded by those who are certain of their own purity of racial motivation. The implication is if one cannot produce irrefutable evidence of clear, blatant and intentional bias, then racism must be banned as a possibility. But this is both silly as an intellectual claim and dangerous as a policy standard.