BY MICHAEL MCAULIFF,DAILY NEWS WASHINGTON BUREAU

Heath Schuler is the type of moderate dem that is ditching on Obama
After proposing the biggest,most ambitious federal budget in history,President Obama isn’t too worried Republicans will get in his way.
It’s Democrats who could give him the biggest headache.Over the last couple of weeks,influential leaders of his party have raised objections to major parts of his $3.5 trillion plan for 2010,especially in the Senate.
Coal states don’t like Obama’s plan to tax pollution. But without the $645 billion “cap and trade”emissions tax,Obama would have to ditch his middle-class tax cut.