12 states up for grabs in make-or-break contest
2016 hopeful has victory margin of more than 20 points
GOP race turns scary as Trump closes in on nomination
Race ugly even by GOP standards in days leading up to election
Sanders, Trump more symptom than symbol amid voter disaffection
Trump, Cruz vie for support in South Carolina
High school student voted for the first time on Tuesday
High school student on Tuesday voted for first time
Candidates win state by significant margins
Presidential candidate ‘exquisitely prepared’ for White House