Historical clue formulations

• Longtime Indiana senator defeated in 2012 — 2016-04-30
• Former six-term senator from Indiana — 2013-07-21
• ___-Obama Proliferation and Threat Reduction Initiative (2007 law) — 2011-10-01
• Sen. Bayh's senior counterpart — 2009-10-17
• Indiana senator Richard — 2005-02-23
• Longtime Hoosier Senator — 1998-11-12
• Senate Agriculture Committee head — 1997-06-08
• Indiana Senator Richard — 1994-07-24