Most of these candidates were endorsed by Ron Paul, and all the Republicans by Republican Liberty Caucus.
2008:
Ron Paul (US President), Tom Tancredo (US President), Dennis Kucinich (US President), Mike Gravel (US President), Mary Ruwart (US President), Brian Miller (AZ-8-US House), Gregory Nemitz (ID-2-US House), Amit Singh (VA-8-US House), Vern McKinley (VA-10-US House), Linda Goldthorpe (MI-1-US House), David Gay (NY-25-US House), Murray Sabrin (IN-US Senate) Robert Orr (NC-Governor)
2009:
Steve Lonegan (NJ-Governor)
2010-2011:
Adam Kokesh (NM-3-US House), R.J. Harris (OK-4-US House), Van Irion (TN-3-US House), Linda Goldthorpe (MI-1-US House), Mike Vasovski (SC-3-US House), Robert Lowry (TX-23-US House), Michael Frisbee (GA-13-US House), Marcy Winograd (CA-36-US House), John N. Hostettler (IN-US Senate), Peter Schiff (CT-US Senate), Clint Didier (WA-US Senate), Jim Bender (NH-US Senate), Chuck DeVore (CA-US Senate), Ray McBerry (GA-Governor), Debra Medina (TX-Governor), Zach Wamp (TN-Governor), Randy Brogdon (OK-Governor)
2012-2013:
Ron Paul (US President) (4/2011-6/2012), R. Lee Wrights (US President) (2011-5/2012), Ken Sumsion (UT-Governor), Bob Fanning (MT-Governor), Bill Randles (MO-Governor), Dan Liljenquist (UT-US Senate), Rick Williams (CA-US Senate), Scott D'Amboise (ME-US Senate), Marc Scaringi (PA-US Senate), Zach Poskevich (TN-US-Senate), Wes Riddle (TX-25-US House), Karen Kwiatkowski (VA-6-US House), Richard Mack (TX-21-US House), Delia Lopez (OR-3-US House), Evan Feinberg (PA-18-US House), Dennis Lamare (NH-2-US House), Eric Martin (PA-4-US House), Eli Olson (WA-2-US House), Floyd Bayne (VA-7-US House), George Harper (TX-14-US House), Ike Eichner (WA-6-US House), Jason Greene (MO-5-US House), David Gerson (MN-2-US House), Michael Firsching (IL-13-US House), Jenny Worman (CA-28-US House), John Fitzgerald (CA-11-US House), Patrick Kelly (KY-6-US House), Peter James (MD-6-US House), Weston Wamp (TN-3-US House), Glen Bradley (NC Senate), Dennis Kucinich (OH-9-US House), Dan O'Connor (NY-7-US House), Norman Solomon (CA-2-US House), Ilya Sheyman (IL-10-US House), Eric Griego (NM-1-US House)
Preferred winner of primary:
Sarah Steelman (MO-US Senate), Eric Hovde/Mark Neumann (WI-US Senate), Don Stenberg/Pat Flynn (NE-US Senate), Brian K. Hill (CT-US Senate)
