That haul included $1.5 million in just one day, Aug. 15, during the campaign's "$15 on the 15th" push. Johnson's campaign on Tuesday also said it had received more than 90,000 separate contributions.

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"The fact that we received more than 90,000 individual small contributions is overwhelming, and a major boost for the campaign. It is increasingly clear that a great many Americans, from across the political spectrum, are ready to join our effort to offer an experienced, credible alternative to the polarizing nominees of the Republican and Democratic parties," Johnson, a former governor of New Mexico, said in a statement.

“These contributions, and the enthusiasm behind them, are providing the fuel we need to take our message of smaller government and greater freedom to the millions of voters who are looking for a way to break the two-party status quo.”

Through June, the most recent campaign filing period, Johnson and running mate Bill Weld had raised $1.36 million. Tuesday's numbers mean that two-week span brought in more than double what the campaign had raised thus far.