From the Huffington Post article on her move:
In putting a hold on both bills, the "National Right-to-Carry Reciprocity Act of 2012," and the "Respecting States' Rights and Concealed Carry Reciprocity Act of 2012," Feinstein is denying them the easiest avenue of passage: unanimous consent.Her move was quickly applauded by Mark Glaze, executive directors of Mayor Bloomberg's Illegal Mayors, who said, "We hear regularly that senators of both parties are getting tired of being ordered around by the gun lobby, and forced reciprocity is exhibit a."
The hold does not eliminate the possibility of passing the bills through regular order, with 60-vote requirements to start and end debate. But it's unclear whether enough support actually exists in the Senate. Sen. Scott Brown (R-Mass.), for instance, has said he would oppose the first bill, which cleared the House of Representatives in November with 43 Democrats supporting it and only seven Republicans voting against it.
I think these senators ought to remember that the "gun lobby" is you and me. Currently, Sen. Dick Lugar (R-IN) is in the process of learning this as he now trails Richard Mourdock according to some polls.
The full letter is embedded below:
Feinstein - hold - Concealed Carry Reciprocity Legislation