Watch: 49ers QB Colin Kaepernick rushes for 90-yard TD vs. Chargers

Colin Kaepernick rushed for a 90-yard touchdown in the San Francisco 49ers' game vs. the San Diego Chargers on Saturday night.

Colin Kaepernick's first rushing touchdown of the season was special -- special enough to be the second-longest by a quarterback in NFL history.

With less than three minutes remaining in the third quarter of the San Francisco 49ers' game vs. the San Diego Chargers on Saturday night, the Niners faced a second-and-6 from their own 10-yard line. Facing pressure from San Diego's pass rushers, Kaepernick stepped up, evaded a tackler and sprinted 90 yards to the end zone.

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Here's the run, sped up for effect:

The play elicited this reaction from 49ers coach Jim Harbaugh, who's facing a flood of rumors about a possible return to college coaching at Michigan:

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The 49ers went on to fall to the Chargers 38-35 in overtime. 

- Mike Fiammetta