Presidential candidate Sen. Marco Rubio (R-Fla.) greets voters at Manchester's Webster School as ballots are cast inside on Tuesday, Feb. 9. (Reuters)

CONCORD, N.H. — Sen. Marco Rubio (R-Fla.), hoping for a strong finish to a tough week of campaigning in New Hampshire, greeted voters early Tuesday at polling places in Manchester and Bedford, N.H., and sounded a confident note about his position in the race.

Rubio, who has been dogged by his presidential rivals for repeating himself several times at Saturday's debate, said he felt "great" about where he was at the conclusion of the New Hampshire race.

"It’s an incredible experience, an incredible process and we’ve loved being a part of it. We’re going to finish strong here and we’re going to head to South Carolina," he said in Manchester.

Tuesday's vote will offer the clearest test yet of whether the attacks leveled at Rubio since Saturday night — Democratic activists have been following him around New Hampshire dressed as robots — will have an effect on his support.

Supporters of Republican presidential candidate Marco Rubio clashed with protesters dressed as robots at a polling place in Manchester, N.H. on the day of the New Hampshire primary. (Twitter/Americans United)

In an interview with ABC's "Good Morning America," Rubio declined to predict victory, or even a runner-up finish. Many supporters are hopeful that after a surprisingly high finish in Iowa, Rubio will finish in the top tier in New Hampshire.

"I don't know about where we're going to finish in terms of the second, third, fourth," said Rubio. He called Trump, who leads in the polls here, the "clear front-runner."

Voting began in New Hampshire this morning for the state's primary. A crowded field and an aggressive campaign has many relieved the circus is coming to an end as candidates wait in anticipation for results. (Dalton Bennett/The Washington Post)