Marco Rubio: A candidate still searching for a viable base

Republican presidential candidate, Sen. Marco Rubio, R-Fla., right, laughs with Sen. Jim Risch, R-Idaho at a campaign rally in Boise, Idaho, Sunday, March 6, 2016. (AP Photo/Paul Sancya)BOISE, Idaho (AP) — Marco Rubio finds his Oval Office ambitions squeezed by Donald Trump’s outsider ambush and the Republican Party’s resulting identity crisis.

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