When President Bush's aides released a television ad Tuesday saying that "no child in America should be left behind," it looked to be the first positive spot the campaign had rolled out in weeks.

Yesterday came the Spanish-language version -- and it packed a far more negative punch.

The education message changed in translation, with the spicier Spanish version -- airing in Florida, Arizona, Nevada and New Mexico -- skewering Bush's Democratic opponent.

"John Kerry praised the president's reforms. Even voted for them," it says. "But now, under pressure from education unions, Kerry has changed his mind. Kerry's new plan: less accountability to parents."

A 60-second radio version concludes: "John Kerry, {iquest}No podemos confiar en tu palabra?" -- meaning "Can your word be trusted?"

The Massachusetts senator's camp responded quickly. "George Bush is misleading the American people in English and now Spanish," said spokesman Chad Clanton. "They've been trying to fool people into thinking they had a positive message, but it's consistent with the unprecedented negative campaign they have run since John Kerry got the nomination."

Bush campaign spokesman Scott Stanzel said the Spanish ads "contrast the president's steady commitment to education reform with John Kerry's ever-changing position on the No Child Left Behind act." Pressed on the difference between the English and Spanish messages, Stanzel said only that "they are just different ads."

Kerry voted for the president's 2001 education reform law but has sharply criticized Bush's handling of it, saying he has shortchanged it and is proposing $9.4 billion less than the maximum authorized by Congress. The Bush campaign counters that education spending has risen 49 percent during the president's term.

While the ad says that "Kerry cambia de opinion" -- changed his mind -- Bush aides provided no evidence for the charge that he bowed to "pressure from education unions," other than an editorial in New Hampshire's conservative Manchester Union Leader.

But Kerry, who is strongly backed by the National Education Association, has proposed changes that critics say would weaken the law. He has said that test results should not be used to "punish" schools and suggested that attendance and graduation rates also be considered in measuring whether struggling schools deserve continued federal aid.

Bush aide Stanzel said Kerry has "waffled" on the law and that such provisions are an attempt to weaken a law "which the teacher lobby obviously doesn't support."

Clanton, the Kerry spokesman, responded that Bush tried to freeze college Pell grants that have disproportionately helped Hispanic students.