Nightly News | January 17, 2014
>>> oklahoma republican senator tom coburn is leaving the senate. he'll depart at the end of this year, two years before his term is due to expire. the senator, who is an obstetrician by training, has been battling a recurrence of prostate cancer . he said his decision to go home was for his family. despite their party differences, senator coburn is known as one of president obama 's friends in the u.s. senate .