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Who cares.
There was a terrible article a few months back by Jacob Weisberg, editor of Slate, attempting to psychoanalyze Hillary Clinton via her iPod, and coming up with (surprise!) the Washington Insider Consensus: she's a phony. Even though her songs were basically middle-of-the-road rock, exactly what you'd expect a Baby Boomer to be listening to.
These pseudo-analyses are at best stupid fluff, and at worst a vehicle for the injection of media bias, as Salon's own Eric Boehlert confirms: http://www.huffingtonpost.com/eric-boehlert/the-media-dems-are-phony_b_21591.html
And, for the record, although "Imagine" might be Ned Lamont's best song to sing, he plays blues/stride piano pretty well. That doesn't really fit into Walter Shapiro's narrative of whiteness, which is probably why he didn't mention it.
Video at: http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=364x1698262