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Rubio: ‘I’m comfortable running as an underdog’

"Keep Calm. Vote Rubio," was the directive supporters waved on poster boards behind the candidate at his Tampa rally Monday night.

Republican presidential candidate, Sen. Marco Rubio, R-Fla., speaks at a campaign rally in Boise, Idaho, March 6, 2016. (Photo by Paul Sancya/AP)
Republican presidential candidate, Sen. Marco Rubio, R-Fla., speaks at a campaign rally in Boise, Idaho, March 6, 2016.AP

Alexandra Jaffe