(MSNBC) A prime obstacle facing Florida Sen. Marco Rubio as he engineers his ascent within the GOP — possibly even to the vice presidency — involves murmurs regarding his previous political career in the Sunshine State.

Rubio’s staff has carefully worked to dispel allegations of impropriety surrounding his dealings with embattled Rep. David Rivera (R-FL), as well as whether he used a card issued by the Florida state GOP to pay for personal expenses.

Well, the senator went great lengths in an extensive interview on Fox News to address those controversies.

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