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Americans vote Tuesday in what is deemed the most pivotal day in the presidential nominating process, with frontrunners Hillary Clinton and Donald Trump hoping to finish off their challengers.

Texas is among more than a dozen states and territories that are holding elections today.

"There is no doubt that if Donald steam rolls through Super Tuesday, wins everywhere with big margins, that he may well be unstoppable", Cruz said Sunday on CBS.

In Georgia, just under half of Democratic voters on Tuesday were black, with 8 in 10 backing Clinton.

Andrea McLaughlin, a 61-year-old Democrat from Vienna, Va., said she supported Clinton in 2008 but was fine with Obama's victory.

However, a nightmare scenario for the Florida senator and his backers is an 0-for-11 night, coupled with Cruz notching more than one victory.

Trump's dominance has rattled Republican leaders, who fear he's unelectable against Clinton in November.

However, in a head-to-head match up, Florida GOP Sen. Graham says there still "may be" a chance for Marco Rubio.

Why is Super Tuesday so important?

Lamar Alexander. Polls show Trump still has an advantage, and since more than a quarter of the vote is expected to come from early voting, any momentum for Rubio may be blunted. Should Cruz lose Texas to Trump, it would effectively end his campaign. Overall, Trump leads the Republican field with 221 delegates.

Likewise, a strong showing by Sanders could shake up Clinton's support among the superdelegates, while a Sanders loss could push her closer to the nomination.

Poll Shows Trump Trailing Both Clinton And Sanders

So what is Super Tuesday all about?

"We can stay in the race, win big showdown battles and wind up with more pledged delegates", Devine said.

On the eve of the biggest day in the presidential primaries for both parties- with 11 states apiece and about a quarter of all delegates up for grabs - Hillary Rodham Clinton retweeted a blunt plea by her Democratic rival, Sen.

How do the states award the delegates votes?

Voters' choices broken out by party provide an interesting window into areas where Trump might hold cross-party appeal.

Republican voters were choosing between the five remaining candidates - Donald Trump, Marco Rubio, Ted Cruz, John Kasich and Ben Carson. Melania Trump, wife of the billionaire GOP front-runner, is broadly unknown, but among those who do express an opinion, more have a negative one than a positive one. Instead, he's watched Trump, a brash NY real estate mogul, display surprising strength with evangelical Christians and social conservatives.

Ted Cruz capture the Republican nomination for president.In the scenario that appears most likely to emerge from the primary contests, Clinton tops Trump 52% to 44% among registered voters.

Beyond the candidates, Matt Teague is filing from Alabama, Lois Beckett from Vermont, Richard Wolffe from Georgia, Lucia Graves from Virginia, Jill Abramson from Massachusetts, Megan Carpentier from Minnesota, Jeb Lund from Arkansas, Sam Levin from Colorado, Julia O'Malley from Alaska and Adam Gabbatt will be reporting from Tennessee.

Rigell says he will not support Trump if he wins the nomination.

On the Democratic side, Clinton is looking to make a statement over Sanders.