Is Obama losing support among some Democrats?

From the AP:

NEW YORK — Could it be that President Barack Obama's Midas touch is starting to dull a bit, even among members of his own party?
Conservative House Democrats are balking at the cost and direction of Obama's top priority, an overhaul of the nation's health care system. A key Senate Democrat, Max Baucus of Montana, complains that Obama's opposition to paying for it with a tax on health benefits "is not helping us."
Another Democrat, Rep. Dan Boren of Oklahoma, tells his local newspaper that Obama is too liberal and is "very unpopular" in his district.
From his first days in office, Obama's popularity helped him pass the landmark $787 billion stimulus package and fueled his ambitious plans to overhaul the nation's health care system and tackle global warming.
Obama continues to be comparatively popular. But now recent national surveys have shown a measurable drop in his job approval rating, even among Democrats. A CBS news survey out this week had his national approval rating at 57 percent, and his standing among Democrats down 10 percentage points since last month, from 92 percent to 82 percent. . . .