Senator Marco Rubio seems to be deftly swatting away attacks from rivals Donald Trump and Jeb Bush, but the barrage coming his way over missed Senate votes, immigration reform and mismanagement of personal finances have prompted him to quietly fine-tune his campaign as he rises in the polls and picks up big donors. Moments before he formally filed for the presidential ballot Wednesday in Concord, N.H., Trump told reporters that Rubio, who posted a strong third place showing in two national polls released this week, has "very big issues" with his finances—specifically, having put thousands of dollars in personal expenses on a GOP American Express card while in the Florida state house—and...
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