Historical clue formulations

• Do some logrolling — 2012-05-29
• Do some logrolling — 2005-03-19
• Compete in a 15-Across — 2004-03-31
• Engage in logrolling — 2003-06-03
• Engage in logrolling — 1997-01-05
• Spin, as a floating log — 1996-07-26