Related Clues:

• ''I second that!''
• ''Same here''
• ''I agree!''
• 'I agree'
• 'I'm with you'
• ''I'm in!''
• Kind of attitude
• Including yours truly
• Joiner's cry
• "I'm with you"
• ''Likewise!''
• ''I'm on board!''
• "Likewise"
• Little brother's cry, perhaps
• 'I'll go along'