The nation's leading tax watchdog charged Friday that President Obama has dropped his promise to block new taxes from families making $250,000 or less.

Instead, said Americans for Tax Reform, the president in new campaign speech language is only promising to limit income tax hikes and only for a year.

The group, headed by influential conservative Grover Norquist, is drawing attention to a speech Obama gave Wednesday in Grand Junction, Colorado, where they say he rolled out a new phrase that should scare taxpayers.

"Obama has altered his 2008 'firm pledge' that no family making less than $250,000 per year would see 'any form of tax increase.' Obama has now limited the pledge to merely income taxes,' and only for next year," said ATR in a release.

Here are the operative quotes according to ATR:

-- On September 12, 2008, speaking in Dover, New Hampshire, candidate Obama said: "I can make a firm pledge. Under my plan, no family making less than $250,000 a year will see any form of tax increase. Not your income tax, not your payroll tax, not your capital gains taxes, not any of your taxes."

-- On Wednesday, August 8, speaking in Grand Junction, Colorado, President Obama said: "So if your family makes under $250,000 -- which, by the way, 98 percent of Americans do -- 97 percent of small businesses do, you will not see your income taxes increase by a single dime next year. That's my plan."

Asked ATR in a release: "Taxpayers may be asking themselves what other tax increases await them if President Obama is given a second term."