Possible Clues:

• Person making the running in UN, say, last of three shunned
• A blessed one, losing energy, needs this implant?
• Leading figure in a field offering hearty support?
• Temporary leader running in circles has one's best interest at heart perhaps
• Giving due respect to kind Republican front runner
• Pacifist has no energy for one of those doing the rounds ahead of everyone else
• Heart patient's aid
• Cardiac device
• Implanted device to control the heartbeat
• Device to regulate the heartbeat