NYT: Bernie and his advisers to discuss whether to deploy a tough anti-Clinton ad in Iowa

The New York Times is reporting that

the decision [Bernie] is now grappling with echoes questions voiced by his supporters as Mr. Sanders finds himself within striking distance of Mrs. Clinton in Iowa: Does he have the stomach to directly attack her, and potentially defeat her, or will he be satisfied having injected important issues into the race and preserving his well-earned reputation for eschewing negative campaigning?

The concrete question: to continue to show the upbeat America ad, or, as some in the Sanders’s campaign urge, to also show an ad that “takes aim at a central vulnerability of Mrs. Clinton, her Wall Street ties, by contrasting Mr. Sanders’s vision for overhauling the financial industry with Mrs. Clinton’s.”

The Clinton campaign, which hasn’t yet seen the new ad, responded that Bernie “has abandoned his claims of a positive campaign in order to parrot Karl Rove’s attacks.”