President Barack Obama and his top allies in Congress groped their way Tuesday towards a hard-fought compromise to ensure final passage of a historic US health care overhaul within weeks.
Obama was to hold evening talks with Democratic leaders of the Senate and House of Representatives as they faced the difficult task of melding their rival versions of the legislation, the president's top domestic priority.
Democratic House Speaker Nancy Pelosi said she was "optimistic" the two sides would bridge the gaps between their bills and agree on what would be the most sweeping overhaul of its kind in four decades.
The discussion, at the dawn of a mid-term election year expected to see Democrats lose seats, was the first in a series aimed at securing final passage by Obama's State of the Union speech in late January or early February.
"There are significant differences. We will be discussing these over the next coming weeks," Democratic House Majority Leader Steny Hoyer said after top House Democrats met behind closed doors ahead of the White House talks.
Pelosi signaled, as she had before, that she would likely accept the Senate's decision to strip out a government-backed "public option" to compete with private insurers -- a necessity to get the 60 votes for passage.
"We will have what we need to hold the insurance companies accountable," promised Pelosi, who steered the measure to passage by a razor-thin margin in November. "And they'll be crying out for a public option one of these days."