Joe Biden nibbles on wife's finger at campaign event

All jokes aside, What was going through his head?

"Joe Biden nibbled on his wife's finger in a bizarre campaign stop moment"

Jill Biden had been speaking to a crowd and using her hands to gesture, barely missing her husband's face at several points.

Eventually, while her arm was outstretched, Biden leaned forward and bit down on the tip of his wife's index finger.

In response, Jill Biden laughed it off.

The pair were in Council Bluffs speaking to a crowd of several hundred people, according to the Associated Press. The Biden are launching an eight-day bus tour of Iowa ahead of the February 3 caucuses.