A new dispute flared Thursday between the Hillary Clinton and Bernie Sanders presidential campaigns: whether Mr Sanders broke his promise not to air TV attack ads.

At issue was a 30-second spot [“Two Visions”] the Sanders campaign will air in Iowa and New Hampshire suggesting that Mrs Clinton’s practice of taking campaign money from Wall Street undercuts her ability to police these firms.

The ad can be seen here.

That’s not an attack ad. That’s a contrast of policies.

Talk about fragile. Haven’t we had enough of that in the White House?