In a head-to-head battle of proxies, Vice President Biden wasted no time Thursday trying to do what many Democrats felt President Obama failed to against Mitt Romney, going on offense with an often disdainful attack on Paul Ryan — who stood his ground against a barrage of Biden grins, guffaws, snickers and interruptions.

The dueling running mates turned the lone vice presidential debate into an uncharacteristically feisty affair, scrapping over everything from the economy to Libya to taxes. But it was the vice president who set the aggressive tone, blatantly striving to hit the reset after President Obama was panned for his lackluster performance at last week’s opening debate.

If Obama was too cold, Biden at times bordered on too hot, analysts said afterward.

He chuckled and smirked through many of Ryan’s responses. But unlike Obama a week ago, he let few points go unchallenged.

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