From Politico:

“House Speaker Nancy Pelosi of California can’t afford to lose any Democrats. And with Stupak threatening to vote against the Senate compromise, she’ll need to offset his vote with other Democrats who voted against it the first time. She might be able to pick up some moderate-to-conservative Democrats who favor the Senate approach, but many of these lawmakers will need to be OK with the final abortion restrictions.

“On the other side, a bloc of abortion-rights backers, led by DeGette, has already promised to vote against any bill that includes Stupak’s amendment, which would prevent people who receive government subsidies from purchasing coverage for elective abortions through the exchange. DeGette believes many of the 41 Democrats who voted for Stupak and “yes” on the House health care bill are willing to work with party leaders to find a middle ground.

“The opposing camps are similarly entrenched on the public option and the method for financing the health care expansion. The House would create a government-sponsored insurance plan, but the Senate bill is silent on this point. After several attempts at compromise, Reid nixed the public option altogether.

“The taxes could prove difficult to bridge. The House relies on a so-called millionaires’ tax, and has refused to consider the tax on expensive insurance plans. The Senate has taken the exact opposite posture. But because the White House has weighed in several times in favor of the tax on “Cadillac” plans, as a key component to slow the growth rate in health care spending, the Senate is likely to win this round.”