U.S. Sen. Rand Paul, R-Ky., in Lexington, Ky., in a file photo from Oct. 25, 2010. (AP Photo/Ed Reinke)

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In a recent article in Politico, reporter James Hohmann says that libertarianism, long considered a radical movement stereotyped as pro-pot, pro-porn and pro-pacifism, is moving into the mainstream.

Led by Sen. Rand Paul, R-Ky., he writes, libertarians hope to become a dominant wing of the Republican Party by tapping into a potent mix of war weariness, economic anxiety and frustration with federal overreach in the fifth year of Barack Obama's presidency.

The retirement of Paul's father, U.S. Rep. Ron Paul, R-Texas, long a libertarian icon but considered slightly goofy, is allowing the movement to try to rebrand itself as a reasonable and serious element of the GOP.

In a rebuttal to the Politico article, though, Reason.com says the movement is trendy because Ron Paul's ideas received an airing during his two presidential campaigns, not because of any efforts by the younger Paul.

According to NPR, Rand Paul himself may have aspirations toward a 2016 presidential run, which would likely raise questions about what many consider the mixed legacy of his father.

When it comes to actually winning elections, however, the movement faces steep challenges: Former New Mexico Gov. Gary Johnson, who ran as the Libertarian Party candidate in 2012, received 1.2 million votes, or 1 percent.

THE TAKEAWAY: Rand Paul's filibuster was a paradigm buster.

"Rand Paul is a very canny politician," Matt Welch, the editor of Reason, told host Tom Weber. "His filibuster [against U.S. drone policy] was a pretty epic moment in American politics ... partly because of the way it completely scrambled the usual left-right paradigm. You had Code Pink and Van Jones giving him a high-five, and you had Bill Kristol denouncing him, and Lindsey Graham and John McCain calling him wacko bird, and this kind of thing. And it really sheds light on the fact that our traditional left-right paradigm isn't always the best way to look at things. Sometimes it's better to look at things in terms of 'Do you favor government intervention,' or 'Do you favor more individual autonomy and control over your life?'

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Libertarianism challenges the old left-right divide