Hillary Clinton and Sen. Marco Rubio, R-Fla., traded jabs on Tuesday as both continue to mull presidential bids in 2016.
Rubio called Clinton a "20th century candidate" during an interview with NPR.
Asked to respond, Clinton told a California radio station, “I know that elections are about the future, and I would look forward in engaging in that kind of debate.”
Clinton enjoys strong support among Democrats hopeful she will decide to run in 2016. Rubio would likely face a deep field of Republican challengers vying for the nomination if he runs.
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-- Andrew Rafferty