WASHINGTON -- Barack Obama cut back on his spending in June after securing the Democratic presidential nomination, building up his cash on hand as Republican rival John McCain outspent him with a heavy dose of television advertising.

Unlike McCain, who spent more than he raised in June, Obama accumulated cash during the month, holding back on a ramped-up television campaign until July. Obama is now matching McCain's and the Republican Party's spending on advertising.

Obama has reported having $72 million cash on hand to McCain's $27 million.

Besides raising his own money, Obama is encouraging his major contributors to help former Democratic rival Hillary Rodham Clinton retire her campaign debt. Yesterday Clinton reported having a $25.2 million debt at the end of June, including her own $13.2 million loan to the campaign.

While McCain reduced his cash on hand from May to June, Obama increased his by $29 million.

The different financial pictures reflect two distinct strategies by the campaigns. McCain plans to accept $84 million in public funds for the fall presidential campaign, a move that prevents him from raising or spending any more money above that sum.

Obama has decided to bypass the public finance system, the first major party presidential candidate in three decades to do so in the general election. That means Obama needs to build up his cash reserves going into the fall campaign, whereas McCain needs to deplete his.

Yesterday, Clinton, who suspended her campaign on June 7, reported raising $2.7 million from donors during the month. She also lent her campaign $1 million to pay off some vendors, bringing her total loan to the campaign to $13.2 million.

Clinton has continued to raise money, and Obama has asked that his donors help her as well to reduce her debt. Clinton owed $5.3 million to her senior adviser and pollster Mark Penn, but aides to Clinton said she first intends to pay off small vendors owed money by the campaign.

She has until the Democratic national convention at the end of August to raise money to pay off her loan, an unlikely prospect. After that, she can only pay herself back $250,000.

Clinton ended her campaign with more than $23 million designated for the general election. She is asking donors whether she can convert that money to the campaign account for her 2012 Senate re-election. Donors can also ask for refunds of that money.