Details missing from Obama's Social Security plan

WASHINGTON (AP) - Barack Obama's bid to place a new Social Security tax on very high incomes is either a bold or foolhardy plan, depending on who critiques it.

But its potential impact is almost impossible to gauge because he is providing few details on basic questions such as what the tax rate might be, what types of income would be taxed and how the taxpayers' benefits would be affected.

The Democratic presidential candidate says he would work with lawmakers from both parties to resolve such matters. Voters generally applaud bipartisan cooperation, but they apparently will go to the polls this fall with only a vague notion of what Obama has in mind.