Obama has lost roughly 40% of the Democratic primary vote to an imprisoned felon in West Virginia, to “uncommitted” in Kentucky, and to a Tennesee lawyer who “could fit snugly on Dylan Ratigan’s MSNBC show” and who no one in Arkansas likely had heard of before (and who is suing for his delegates).

All of this gave rise to what is one of the great lines of this campaign season, maybe ever, from James Taranto:

Nobody is challenging Barack Obama in the Democratic primaries this year–and is doing surprisingly well.

All of this also led Chris Cillizza to note that Democrats are whispering, Is it racism?

That President Obama lost roughly 40 percent of the vote in Democratic primaries in Arkansas, Kentucky and West Virginia over the last two weeks has drawn massive national headlines.

Those headlines have drawn a collective eyeroll from Democrats — and many others who closely follow national politics — who ascribe the underperformance by the incumbent to a very simple thing: racism.

No, none of these Democrats are willing to put their name to that allegation — either generally or for this story. But, it is, without question the prevalent viewpoint they hold privately.

They argue that conservative white Democrats — particularly those in the South and Appalachia — don’t want to vote for an African American for president and, therefore, are willing to cast a ballot for almost anyone else up to and including an incarcerated felon. (Keith Judd, we are looking at you.)

Obviously it’s at least part racism.

After all, Nobody is the most racist guy in America.