For a very long time, pot was not something that politicians talked all that much about.

But in recent years, public attitudes on marijuana legalization have shifted considerably --  more than half of all Americans thought pot should be legal in Pew polling done earlier this year -- and, with them, politicians' stances on cannabis.

Kentucky Sen. Rand Paul has openly speculated about changing his party's stance toward pot. New Jersey Gov. Chris Christie signed a measure that would allow medical marijuana for children. This week, White House deputy press secretary Josh Earnest even got a question about pot.

We talked to Marijuana Policy Project's Dan Riffle about changing attitudes toward pot and what it might mean for policy in the country.

Dan Riffle, the federal lobbyist for the Marijuana Policy Project, talks legalizing pot, libertarianism and stereotypes of a marijuana lobbyist. (The Washington Post)