Three other Republican presidential hopefuls have joined Texas Gov. Rick Perry's lawsuit challenging Virginia's ballot access law.
A federal judge in Richmond, Va., on Wednesday granted a motion by Newt Gingrich, Jon Huntsman and Rick Santorum to intervene in the lawsuit.
Perry went to court after failing to collect enough signatures from registered voters to get on Virginia's GOP presidential primary ballot. Gingrich also failed to qualify, leaving Mitt Romney and Ron Paul as the only candidates on Virginia's March 6 primary. Huntsman and Santorum did not submit petitions.
Perry's lawsuit claims the state's requirement of 10,000 signatures, including at least 400 from each of the state's 11 congressional districts, is unconstitutional. A hearing on Perry's request for a preliminary injunction is set for Jan. 13.