Related Clues:

• Threw one's hat into the ring
• Executed, as a program
• Sprinted or jogged
• Did one leg of a triathlon
• Screened for an audience
• Accepted a nomination
• Ended a triathlon
• Got on the ballot
• Left in a haste
• Joined the marathon
• Didn't join the fight, perhaps
• Did track
• Showed fear, maybe
• Flew on foot
• Did cross-country, e.g