As if the armed man strutting outside of Obama's town-hall meeting Tuesday wasn't enough cause for concern, a new study by the Southern Poverty Law Center finds that militias are rapidly growing across the U.S. The trend is tied to the economic recession, the first black president, and a spike in conspiracy theories, the Associated Press reports. One special agent with the ATF said the increase in militias was "the most growth he had seen in a decade," and that "All it's lacking is a spark." The report found that 50 new groups had sprouted in only the last few months and that the likelihood of "mass-casualty attacks" are higher than in the 1990s due to the fact that the armed groups are more prone to violence than ever. In addition to the concern over militias, so-called lone wolves, like the man charged with the D.C. Holocaust Museum attack are also worrying the Feds.