Democrat Hillary Clinton aims to build an impregnable lead on "Super Tuesday," the most consequential day of the presidential nominations calendar, while Republicans struggle to derail their frontrunner Donald Trump.
White House hopefuls Ted Cruz and Marco Rubio unleashed a barrage of attacks against Donald Trump during Republican debate as they sought to halt the frontrunner's relentless march to nomination.
Republican contender Marco Rubio struggled at a presidential debate, potentially confounding his bid to emerge as Donald Trump's chief rival in New Hampshire and giving hope to three rivals desperate for a strong showing.
