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Joe Biden and his new running mate, Sen. Kamala Harris (D-Calif.), held their first joint appearance Wednesday at a Delaware high school, Stephen Colbert said on Wednesday's Late Show. "It was a warm and energetic launch to their campaign, but when Biden took the stage, Joe did not pull any punches, especially when it came to Trump attacking his running mate." He found Biden's line that "whining is what Donald Trump does best" a bit unfair.

"One person who was not thrilled with Biden's choice is his opponent," and Trump's "criticism had a familiar ring to it," Colbert said. Oddly, "one person Trump thinks Harris was particularly 'nasty' to is her new running mate."

"Like, is Trump attacking or defending Joe Biden? I can't tell," Trevor Noah said at The Daily Show. "I mean of all people, Donald Trump should totally understand how you can be with a woman who's publicly humiliated you."

"Kamala Harris on the ticket with Joe Biden is a genius move by the former VP, because not only does she tick a bunch of boxes, but clearly, conservatives are gonna struggle to put her in one," Noah said, playing a highlight reel. "Honestly, it's kind of cute watching Republicans flail around trying to figure out the right talking points." He illustrated the GOP confusion with a mock attack ad.

"As of right now, Biden and Harris are up by 10 points on Trump and Pence," Jimmy Fallon said at The Tonight Show. "Just to rub it in, at the end of their event they both moonwalked down a ramp." He showed, then mimicked, Trump's attacks on Harris. "Meanwhile, in a new attack ad, the Trump campaign has already labeled them 'Slow Joe and Phony Kamala,'" Fallon said. "And if you have a 'Slow' and 'Phony' joke that doesn't end with 'Those used to be Trump's nicknames for Eric and Don Jr.,' write to us."

The Late Late Show's James Corden showed Harris slamming Trump at her joint event with Biden. "Donald Trump getting bullied in a high school gym! It's honestly the first time I've related to him." He and his crew agreed that Harris is a much better pick than Hillary Clinton's running mate, who they made a show of not remembering.

And The Late Show had some condolence cards for all the running mates who didn't make the cut. Watch below. Peter Weber