Democratic candidates sharpen attacks in closing days of New Hampshire primary

Nashua, New Hampshire (CNN) - So much for "Iowa nice."

The contentious contours of the Democratic presidential primary came into full view in New Hampshire over the weekend, as months of cordial campaigning in Iowa quickly escalated into a raucous sprint to Tuesday's primary.
Vermont Sen. Bernie Sanders and former South Bend, Indiana, Mayor Pete Buttigieg, both drawing the largest crowds in the Granite State after a near-tie in the Iowa caucuses, began treating each other as primary rivals for the Democratic nomination.
Former Vice President Joe Biden, meanwhile, unleashed the harshest attack advertisement of the primary to date, targeting Buttigieg as he struggles to regain his footing and prevent his support among moderate Democrats from evaporating amid a worse-than-expected finish in Iowa and a new threat for that centrist lane from Minnesota Sen. Amy Klobuchar, whose events mostly outdrew Biden's over the weekend.