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He noted, for example, that Chelsea Clinton traveled to the Texas state convention two days after the concession speech and that her trip was covered by the media.

“There was minimal residual political activity in the weeks after June 7th that only involved maintaining delegates already pledged during the primaries,” he said, adding that June primaries were held in Puerto Rico, South Dakota and Montana.

“Essentially, it was seeing the process through to its complete end … That’s all. Nothing more.”

Still, Ms. Moskwa in her letter to the FEC called June “an active month with substantial political activity.”

Throughout June, the Clinton campaign continued contesting delegates, paying staff to travel to delegate-selection events, renting booths and footing the bills for banner ads, convention booklets and get-out-the-vote expenses, Ms. Moskwa told the FEC.

It wasn’t until June 29 - the day Mr. Obama and Mrs. Clinton held a “unity” event in New Hampshire - that the Clinton campaign stopped efforts “aimed at garnering additional delegates,” according to Ms. Moskwa’s letter.

FEC officials were unavailable for comment late Sunday.

More than four months later, Mrs. Clinton’s campaign remains mired in debt. If she gets the expected appointment to be Mr. Obama’s secretary of state, she wouldn’t be allowed to personally raise money to retire her debt, though her presidential campaign committee can continue trying to pay off her bills.

On Wednesday, supporters received e-mails from the Clinton presidential campaign with a message from former Clinton White House social secretary Capricia Penavic Marshall.

“As we look forward to a new era in Washington, there is still one piece of unfinished business where Hillary needs your help,” she wrote. “We need to do all we can to help Hillary by acting now to reduce her remaining debt.”

Most of Mrs. Clinton’s outstanding debt stems from more than $5.3 million owed to Penn, Schoen & Berland Assoc. LLC, headed by Mark Penn, former chief strategist to the Clinton campaign. There’s no deadline for when Mrs. Clinton must repay Mr. Penn.

In fact, former President Bill Clinton’s 1996 presidential campaign fund lists more than $100,000 in remaining debts, though all of them are reported as “disputed” on recent FEC filings. The figures include more than $80,000 to Penn & Schoen in connection with disputed consulting fees and polling work.

A spokeswoman for Mr. Penn declined to comment and referred questions to Mrs. Clinton’s campaign, which did not respond to questions about whether officials planned to renegotiate or dispute any of the money owed to Mr. Penn’s firm.

Despite the debt, Mrs. Clinton has still been spending tens of thousands to help elect fellow Democrats through her political action committee, HillPac. In September and October, HillPac spent at least $80,000 in campaign donations to members of Congress.