Biden's journey: After getting knocked down, he keeps getting back up.

President Joe Biden comes to the Democratic National Convention in Chicago this week both revered and resigned. Biden had consolidated his party’s support and did not have a serious competitor. But that support crumbled after a disastrous debate in June when his frailities were on unsparing public display, reinforcing his greatest liability — that at his age, he might no longer be up for the job. In Chicago, Biden has decided to get back up and show the difference between stepping aside and quitting.