Mr. Sanders, who has drawn support by electrifying crowds with his demands for single-payer health care, free tuition at public colleges and higher taxes on the rich, has tested the idea that a modern presidential candidate cannot win without relying on attack ads or internal polling. But he and his advisers, armed with more money than they expected, are now forming a battle plan beyond immediate goals of winning Iowa and New Hampshire.

At Mr. Sanders’s headquarters here on Wednesday, his top advisers met with their lieutenants from Iowa, New Hampshire, and South Carolina — three of the four states with the earliest nominating contests, all in February — to plan the redeployment of dozens of paid staff members thereafter. The workers will go to Super Tuesday states that Mr. Sanders views as winnable — including Colorado, Massachusetts and Minnesota — as well as to Southern states where Mrs. Clinton is expected to perform well, but where close contests could also yield delegates for Mr. Sanders.

Super Tuesday, on which 13 states have scheduled primaries or caucuses, is March 1, 2016.

“With our latest fund-raising numbers, we now know we’ll have the resources to compete everywhere, including all the Super Tuesday states and throughout the South, even Arkansas,” said Jeff Weaver, Mr. Sanders’s campaign manager. “We’ve heard for months, ‘Bernie will flame out after Iowa and New Hampshire.’ But the truth is that we have the resources, and can raise the resources, to go all the way to the convention.”

Mr. Weaver, who spent part of Wednesday interviewing potential staff members in Georgia and Texas, is also working with the campaign’s senior adviser, Tad Devine, on a first round of television commercials to run before Thanksgiving. The Sanders camp is weighing biographical ads to run in Iowa, where Mr. Sanders is less well known than Mrs. Clinton. In New Hampshire, where Mr. Sanders is a familiar presence from his three decades in Vermont politics, a thematic or policy-driven ad may be used first.