The crowded list of potential candidates who are mulling runs for the Republican presidential nomination gathered in New Hampshire this weekend to court early voters and test the waters.

Only three candidates have officially announced they are running for the nomination: Sens. Ted Cruz, of Texas; Rand Paul, of Kentucky; and Marco Rubio, of Florida. But there are more than 15 others who have signaled they are weighing potential bids, including Long Island's Rep. Peter King.

The most talked-about candidate at New Hampshire's First in the Nation Republican Leadership Summit this weekend turned out to not even be a Republican. One by one, the potential GOP presidential hopefuls made their case for a better America, but also took their shots at Democratic presidential candidate Hillary Clinton.

"Hillary Clinton cannot be president of the United States, but not because she's a woman," said Carly Fiorina. "Hillary Clinton must not be president of the United States because she does not have a track record of accomplishment."

 "I'm starting to worry that when Hillary Clinton travels, there's gonna need to be two planes," said Rand Paul. "One for her and her entourage, and one for her baggage."

Paul also spoke about how Republicans believe their party can appeal to voters who may not traditionally vote for the GOP.

Rep. Peter King spoke at the summit as well, and while he disagrees with Paul on some issues, King says he, too, believes the Republicans need to expand their base.

One man who enjoyed much of the spotlight this weekend was former Florida Gov. Jeb Bush. The son and brother of former presidents is establishing himself as a potential front-runner, but he told Granite State voters that he doesn't believe his name alone will carry him to the nomination, if he runs.

While the Republican field appears to be wide open, the same can't be said across the aisle, or at least not yet. Hillary Clinton remains the only Democratic candidate to officially announce a presidential bid.