Vice President Joe Biden says he isn't willing to run for president if he isn't able to give "110-percent" of his heart and soul on the job.  In an emotional interview Thursday night on CBS' "The Late Show with Stephen Colbert," it was clear to see that Biden is still coming to terms with the death of his son Beau Biden last May.

He said that while he considers he's had a successful life, he feels he's letting his son down.  Whether or not he'll be running for president, he said he feels that in order to run, he should be able to give his full "energy and passion" to the job. He said he'd "be lying" if he said he was there. 

The host went on to say that if Biden doesn't run, he would be "sorely missed."  This is the 72-year-old's first television interview since the death of his son.