How so? Dan Amira explains:
Obama is not proposing that families making up to $250,000 a year keep their tax cuts while families making more than that don’t. He’s proposing that every family keep their tax cuts on their first $250,000 of taxable income (which is not the same as “income” or “earnings,” by the way).
That includes families with taxable income of $260,000, $1 million, $5 billion, $3 trillion, or whatever Jay-Z and Beyonce make in a year. Everyone would continue to pay a lower tax rate on their first $250,000 of taxable income under Obama’s plan. To report that Obama only wants to maintain tax cuts for families making less than $250,000 is simply false.
[. . .]
Normally, a president would want to publicize that he’s trying to cut taxes for everyone in the country. But Obama actually has an incentive this time to downplay the number of Americans who would benefit from his tax plan. His proposal is, at its heart, a political maneuver meant to force Mitt Romney to defend tax cuts for the wealthy. It’s more effective, then, for it to be seen as a cut solely for the middle class. The reality is that Obama’s proposal would also keep Warren Buffett’s taxes lower, if only a little bit.
H/T to Iowahawk for the link.