Response

Though the ad placed minorities front and center in several shots, David Brock, who runs Correct the Record, a Clinton-aligned group, said the many views of Mr. Sanders’s large crowds showed that his following was overwhelmingly white. “From this ad, it seems black lives don’t matter much to Bernie Sanders,” Mr. Brock told The Associated Press. The statement received a harsh rebuke from the Sanders campaign, which recalled Mr. Brock’s early career as a conservative author, calling him a onetime “right-wing extremist.”

Impact

The ad, created by Devine Mulvey Longabaugh, has a vastly different feel from anything else seen in the race since Mrs. Clinton announced her candidacy in a hope-filled two-minute video in April 2015. It strikingly contrasts with Mrs. Clinton’s own minute-long closing argument to Iowans, replete with grave warnings and bold promises. And it is likely to stand out amid the clutter of attack ads and boasts from candidates and their allies in both parties.

Changing channels…

Familiar Face



Senator Marco Rubio’s campaign is the first to turn a celebrity endorsement into a television ad, with Rick Harrison, the host of the reality show “Pawn Stars.” Saying he can detect a fraud, Mr. Harrison assures viewers: “When this guy walked into my shop, I knew he was the real deal.”

Local Hero



Most presidential campaigns distill their national message into 30 seconds and plop it between newscasts in the early states. But the campaign of Senator Ted Cruz is focusing on a hyperlocal issue, with a spot that has the look and feel of an ad for a House candidate, not a leading presidential contender: promising to protect Fort Jackson in Columbia, S.C., from thousands of job cuts.

Watch Me Now



Right to Rise, the “super PAC” supporting Jeb Bush, came up with an inventive way to make sure its 15-minute video was viewed: by putting it in the mail, not in the form of a DVD but with a video mailer. The mailers, with glossy screens the size of an iPad Mini, arrived in the mailboxes of supporters the campaign considers influential, and the video, the length of a documentary short, began to play as soon as the package was opened.