Possible Clues:

• '___ Have No Bananas'
• With 47-Across, 2008 campaign slogan
• "--- Have No Bananas"
• "___ Have No Bananas"
• '___ Can' (2008 campaign slogan)
• "___ can!" (optimistic shout)
• "__ Can": 2008 slogan
• '___ Can' (Obama campaign slogan)
• Start of a 2008 campaign slogan
• '___ can' (campaign slogan)