Opinion: Biden's ad scorching Buttigieg serves a purpose

The ad highlights the important domestic and international issues Biden has dealt with in his career, like helping pass the Affordable Care Act and negotiating the Iran nuclear deal, and contrasts those with Buttigieg's initiatives in South Bend like the crisis of lost pets.The attack ad signals a new phase of the primary contest where candidates need to move voters, both for them and against their opponents, in order to survive in the race.

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