Who's in and who's out:
Republican:
Ted Cruz: 2015 Mar 23 -
Rand Paul: 2015 Apr 7 - 2016 Feb 3
Marco Rubio: 2015 Apr 13 - 2016 Mar 15
Ben Carson: 2015 May 3 - 2016 Mar 4
Carly Fiorina: 2015 May 4 - 2016 Feb 11
Mike Huckabee: 2015 May 5 - 2016 Feb 1
Rick Santorum: 2015 May 27 - 2016 Feb 3
George Pataki: 2015 May 28 - 2015 Dec 29
Lindsey Graham: 2015 Jun 1 - 2015 Dec 21
Rick Perry: 2015 Jun 4 - 2015 Sep 11
Jeb Bush: 2015 Jun 15 - 2016 Feb 20
Donald Trump: 2015 Jun 16 -
Bobby Jindal: 2015 Jun 24 - 2015 Nov 17
Chris Christie: 2015 Jun 30 - 2016 Feb 11
Scott Walker: 2015 Jul 13 - 2015 Sep 21
John Kasich: 2015 Jul 21 -
Jim Gilmore: 2015 Jul 29 - 2016 Feb 12
Democratic:
Hillary Clinton: 2015 Apr 12 -
Bernie Sanders: 2015 Apr 30 -
Martin O'Malley: 2015 May 30 - 2016 Feb 1
Lincoln Chafee: 2015 June 3 - 2015 Oct 23
Jim Webb: 2015 Jul 2 - 2015 Oct 2
Lawrence Lessig: 2015 Sep 6 - 2015 Nov 8
The glue factory must be busy!