Assertion: president's position | /r/HasProperty | held by patrick leahy
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Source sentences:
text: The position has been held by Strom Thurmond (R-South Carolina) (2001–2003), Robert Byrd (D-West Virginia) (2003–2007), Ted Stevens (R-Alaska) (2007–2009) and Patrick Leahy (D-Vermont) (2015–present).