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Over the weekend, Democratic presidential candidates swung through Southern California, making their pitches to state party officials in Long Beach and to young voters at California State University Los Angeles.

And as has often been the case in a race marked by an extremely crowded field — and one that has managed to become even more so in recent days — it was telling who showed up and who didn’t.

Former Vice President Joseph R. Biden Jr. visited Los Angeles Trade Technical College on Thursday, where he slammed Republicans for yielding to the N.R.A. hours after a shooter opened fire at Saugus High School in Santa Clarita, but he didn’t attend the party’s convention in Long Beach and didn’t participate in a Univision forum there.