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https://npr.brightspotcdn.com/dims3/default/strip/false/crop/8640x4860 0 450/resize/1400/quality/100/format/jpeg/?url=http://npr-brightspot.s3.amazonaws.com/00/84/1f30d4424073bfc33ebeb17162ac/gettyimages-2161483356.jpgBiden called to “lower the temperature” in politics in remarks Sunday after the former president was shot at during a political rally.