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Inhofe, Rubio join effort vowing to filibuster gun legislation

Quite the alliance is forming on Capitol Hill. How about this grouping? Rand Paul, Mike Lee, Ted Cruz, James Inhofe, and Marco Rubio.

Inhofe and Rubio (R-FL) have signed onto a letter threatening to filibuster any gun restrictions, according to Inhofe's office.

The letter was originally signed by tea party favorite Sens. Paul (R-KY) and Lee (R-UT), and joined by Cruz (R-TX).

It reads:

Dear Senate Majority Leader Harry Reid,

We, the undersigned intend to oppose any legislation that would infringe on the American people's constitutional right to bear arms, or on their ability to exercise this right without being subjected to government surveillance.

The Second Amendment to the Constitution protects citizens' right to self-defense. It speaks to history's lesson that government cannot be in all places at all times, and history's warning about the oppression of a government that tries.

We will oppose the motion to proceed to any legislation that will servce as a vehicle for any additional gun restrictions.

The vowed opposition further complicates Democrats' efforts to pass gun legislation, post-Newtown, and makes it more likely that any effort will need Republican support to achieve the 60 votes necessary to overcome a filibuster.