The Texas senator has largely been out of the headlines after his third-place showing in New Hampshire. But that was not a bad finish for him, and now the calendar is shaping up better for him.
The total ballots cast and turnout among Republicans was the highest ever. But, for Democrats, it was big, but not perhaps as "huge" as Bernie Sanders made it out to be.
The reaper is nearer in the Republican field. The end of the dream may come for any of six candidates who desperately need at least a respectable finish in New Hampshire.
Did Rubio do serious damage during Saturday's debate? Does Trump need a better ground game? Will Sanders ride a huge win into other states? And how many more Republicans will leave the race?
The earliest polls in New Hampshire primary open at Tuesday at midnight in Dixville Notch, Millsfield and Hart's Location. Dixville Notch boasts of a streak of correctly predicting the GOP nominee.
"I would pay for them to keep running that clip, because that's what I believe passionately," Rubio said of a much-aired video excerpt if him repeating a line at Saturday's debate.
New Hampshire has a reputation for strong voter participation and independents. It's really easy to get on the ballot, and it has had a better track record of picking GOP nominees in recent years.
Florida Sen. Marco Rubio is drawing big crowds in New Hampshire, where he's not just eyeing Donald Trump and Ted Cruz, but also hoping to wrap up after a strong showing in Iowa.