Perhaps it's fitting that the state that kept everyone up late last night, waiting for results, was Ohio. It's a swing state, and it seems every four years, in the fall, Ohio becomes the center of attention in a presidential election.
This year, as NPR's Tamara Keith reports, it just happened a little earlier.
TAMARA KEITH, BYLINE: Talk to Ohio voters - Republicans and Democrats alike - and there's one issue that rises above all the others.
There's something funny happening in Ohio according to CNN's exit poll — Mitt Romney is appealing to some of the very income and education groups in Ohio that were supposed to be Rick Santorum's strength, voters with relatively low incomes and no college.
That could be bad news for Santorum since Romney also attracts the highest income, college educated voters as well that populate Ohio's big city suburbs and exurbs.
Super Tuesday was an almost perfect reflection of the Republican presidential primary process so far this year.
Mitt Romney won the most states and built up a solid lead in delegates. Yet he was forced to vastly outspend his nearest rival to win the most important contest — Ohio, where he narrowly defeated Rick Santorum.
Romney won five other states, but Santorum captured three, and former House Speaker Newt Gingrich won one.
It's been this way for Romney all year. With a potentially game-changing contest on the line, Romney has always found a way to win.