Senator Elizabeth Warren (D-Mass.) urged the federal government to “join the 21st century” and deschedule marijuana during a Tuesday night appearance on The Late Show with Stephen Colbert. However, she declined to answer Colbert’s playful query about her personal cannabis use. Colbert asked the senator the difference between descheduling and legalization. And “Are you high right now?” A longtime advocate for cannabis legalization, Warren took on Colbert’s first question and laughed at his second. “The answer is legalization is what you could do if you had a functional Congress,” she said. “Wel…