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Marco Rubio

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Republican front-runner Donald Trump has dominated Super Tuesday polls, giving him an opportunity to extend his lead over his rivals, Ted Cruz and Marco Rubio

Republican front-runner Donald Trump has dominated Super Tuesday polls, giving him an opportunity to extend his lead over his rivals, Ted Cruz and Marco Rubio. Should Cruz and Rubio fail to win votes today, their campaigns may struggle to survive. With more on today's GOP race, CBS News' Major Garrett joins CBSN from Georgia.

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Marco Rubio and Donald Trump traded more jabs over the weekend, with Trump mocking Rubio's ears and Rubio attacking Trump's "small hands" and electability

Marco Rubio and Donald Trump traded more jabs over the weekend, with Trump mocking Rubio's ears and Rubio attacking Trump's "small hands" and electability. This comes as 11 states holding nominating contests on March 1, known as Super Tuesday. With more on what's at stake, CBS News Senior Political Editor Steve Chaggaris and Potomac Strategy Group's Matt Mackowiak join CBSN.

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Republican front-runner Donald Trump is receiving criticism from both parties for his refusal to disavow the Klu Klux Klan and white supremacist David Duke during an interview Sunday

Republican front-runner Donald Trump is receiving criticism from both parties for his refusal to disavow the Klu Klux Klan and white supremacist David Duke during an interview Sunday. Republican rival Marco Rubio condemned Trump for not disavowing the KKK, saying it makes him "unelectable." Trump later responded on Twitter. Watch the back and forth on the campaign trail Sunday. CBSN's Vladimir Duthiers has the details.

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GOP presidential candidate Sen. Marco Rubio, R-Florida, calls front-runner Donald Trump a “world-class con artist” and accuses him of ripping off American people. The self-proclaimed “underdog” has committed to “be in as many states as it takes"

GOP presidential candidate Sen. Marco Rubio, R-Florida calls frontrunner Donald Trump a “world-class con artist” and accuses him of ripping off the American people. The self-proclaimed “underdog” has committed to “be in as many states as it takes to ensure that I'm the nominee and that Donald Trump never gets to 1,236 delegates.”

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Ahead of Super Tuesday’s nominating contests, “Face the Nation” has the latest on the 2016 campaign trail, with Republican candidates Donald Trump, Texas Sen. Ted Cruz, Florida Sen. Marco Rubio, Democratic candidate Bernie Sanders, and others

Ahead of Super Tuesday’s nominating contests, “Face the Nation” has the latest on the 2016 campaign trail, with Republican candidates Donald Trump, Texas Sen. Ted Cruz, Florida Sen. Marco Rubio, Democratic candidate Bernie Sanders, and others.

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