A make-or-break health care vote this week that's expected to be a cliff-hanger has President Barack Obama working overtime to turn up the heat on Democratic lawmakers.

The president is wooing freshman Democrats in the Oval Office and aides to the lawmakers invited say there were at least two one-on-one sessions in the past few days that never appeared on his official schedule.

Both voted "no" when the legislation passed the House on the first go-round last year, but now they're not ruling out siding with the president.

With a number of anti-abortion Democrats expected to defect over provisions they contend allow federal funding of abortion, every vote will count for Democratic leaders. They need to win over lawmakers who opposed the legislation the first time -- and keep reluctant supporters on board in the face of escalating attacks.