Progressives to taste the racism Smear?

Progressive 2008 Obama voters find themselves finds himself in an interesting predicament.  With liberal progressives and even those within the black community unsatisfied with the his agenda there is a curious shot being fired in the progressive publication, The Nation.  Melissa Harris Perry writes in this weeks online issue that a more pernicious racism could very well be afoot.  In spite of President Obama's efforts to minimize the issue of raise, at least in his public voice, the table is now being set to guilt those unsatisfied with his work as a progressive and possibly set up a primary challenge for him prior to the 2012 general election. 
Harris-Perry points out the obvious that voters were willing to bring him into office in 2004 as a senator in Illinois (against a black republican opponent no less) and then again 2008.  To her credit she admits that the most "naked, egregious and aggressive form" of racism is no longer a factor.  She comes to this conclusion by pointing out the less obvious (which I take at her word as I've not researched it myself) by comparing the "roll-off" vote in prior elections.  "Roll off" is the number of voters who vote in a primary election but then fail to vote in current year municipal, state or local elections.  The same can be compared to off year elections.  For example, those who voted in the Kerry-Bush race in 2008 but refused to vote in the Illinois senate race which was comprised of Obama and another black candidate Alan Keyes.  If the number votes cast were significantly lower for the senate race then one could deduce that racism was still alive and well.  The "roll off" was statistically insignificant.  This allowed Harris Perry to conclude the worst form of racism is no factor.

But don't celebrate yet.  According to Harris Perry we still need to look out for what she has termed "liberal electoral racism".  This is defined as "...the willingness to abandon a black candidate when he is just as competent as his white predecessors.  She goes on to compare the legislative "successes" of President Obama and President Clinton concluding of course that Obama has seen as much success as did President Clinton.  Concluding that both Clinton and Obama are centrist Presidents.  Of course she concludes the only difference between the two:  one is white and the other is black.  Therefore any push for the base to abdicate him, or heaven forbid, push for a primary challenger will indicate a form of racism that still exists.  An interesting theory I disagree with on many levels but I will leave the reader to decide.

What I find equally interesting is the comments section.  "I love you Melissa but bunk!"  or "...don't you listen to the reasons liberals give for being very unhappy with President Obama? To blame it on racism is, frankly, insulting...".  On and on it goes.  I don't know if a primary challenge is in the cards or not, but it offers some small satisfaction to see those that would accuse me of racism for not voting for this President (much less agreeing with His policies) beginning to get back a bit of their own medicine.  Is it possible they will learn from this and cease and desist?