Democrats, 2016 and the fight over Obama's legacy

My latest piece, for The New York Times online:In fundamental ways, the 2016 Democratic primary has been a litigation of the Obama years, and of whether the president’s 2008 campaign vow of “change we can believe in” succeeded or failed.http://www.nytimes.com/2016/02/29/opinion/campaign-stops/clinton-sanders-and-the-fight-over-obamas-legacy.html?action=click&pgtype=Homepage&clickSource=story-heading&module=opinion-c-col-left-region&region=opinion-c-col-left-region&WT.nav=opinion-c-col-left-region