WSJ

Recently elected Democrats from higher-income areas also have been cautious about legislation that would make it easier for labor unions to organize, and about legislation imposing tough new rules on banks. Republicans have savaged the new Democrats for supporting legislation to stem global warming by capping greenhouse-gas emissions, then forcing polluters to purchase and trade emissions credits -- a "cap and tax," the GOP says.
But planned tax increases are likely the source of the toughest intra-Democratic tensions. The president wants to allow George W. Bush's income-tax cuts to expire in 2011 for families earning at least $250,000 and to stop the estate tax from being repealed next year. Mr. Obama also campaigned on putting an additional payroll tax of two to four percentage points on incomes above $250,000 to help put Social Security back on solid footing. As the president confronts a surging budget deficit and presses his ambitious agenda, all those tax increases may be necessary to make ends meet.
All together, Democratic plans could push the top tax rate to 47%, the highest level since the tax code was rewritten in 1986.