He's not ready to stand for 13 hours again, yet, but Sen. Rand Paul does intend a silent procedural filibuster against new Senate gun control legislation, along with Texas' Ted Cruz and Utah's Mike Lee.
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As Huffington Post explains, this would be the less-dramatic form of filibuster, looking:
much different than Paul's channeling of "Mr. Smith Goes To Washington." In fact, it won't look anything at all like his prior effort. Under Senate rules, if Reid can't get broad bipartisan support to move to debate a bill, he needs unanimous consent. Paul and Cruz are threatening to withhold that consent, which launches a silent filibuster.
Backers of filibuster reform have argued previously that, at a minimum, Reid should eliminate the ability to filibuster a motion to proceed. Reid declined the opportunity, but has since expressed frustration that gridlock continues.