MS NOW

Rubio’s rivals take aim at his biggest vulnerability

Marco Rubio has spent months avoiding his biggest vulnerability. His rivals have a new message: "Time's up."

Sen. Marco Rubio, R-Fla., accompanied by Sen. Ted Cruz, R-Texas, speaks during a news conference on Capitol Hill in Washington, Sept. 27, 2013. (Photo by J. Scott Applewhite/AP)
Sen. Marco Rubio, R-Fla., accompanied by Sen. Ted Cruz, R-Texas, speaks during a news conference on Capitol Hill in Washington, Sept. 27, 2013.AP

Steve Benen is a producer for "The Rachel Maddow Show," the editor of MaddowBlog and an MS NOW political contributor. He's also the bestselling author of "Ministry of Truth: Democracy, Reality, and the Republicans' War on the Recent Past."