(CNN) - Likely GOP presidential nominee Mitt Romney will mark his first primary night without a major challenger by returning to the state that gave him his first win of the cycle, New Hampshire.
Romney will be in New Hampshire on Tuesday for an event his campaign bills as "A Better America Begins Tonight" as votes from five states - Pennsylvania, New York, Connecticut, Delaware, and Rhode Island - are counted and announced.
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The Granite State was Romney's first victory this year after he lost the first contest, Iowa, by a slim margin to Rick Santorum.
Santorum, a former U.S. Senator from Pennsylvania, withdrew from the GOP field ahead of his home state's vote, as fund-raising slowed, the math appeared stacked against him, and his young daughter was hospitalized for the second time since he began campaigning.
Contested primaries are all but in Romney's rear-view mirror, with only former House speaker Newt Gingrich and Texas Rep. Ron Paul remaining in the race. Neither appear likely to win the 1,144 delegates needed to clinch the nomination.
A campaign aide told CNN that the Granite State is "where the campaign kicked off, and we see this Tuesday as when the general will kick off - so are going back to where it all started."
In New Hampshire, Romney occasionally appeared alongside an endorser floated as a possible vice presidential pick: first-term U.S. Sen. Kelly Ayotte. Romney will campaign Monday in Pennsylvania with another senator and possible pick, Marco Rubio of Florida.
- CNN's Rachel Streitfeld and Gregory Wallace contributed to this report.