Washington ? With time and tempers short, everyone’s playing hardball in the drive to pass — or stop — President Barack Obama’s massive health care legislation by the weekend.

Business groups are spending $1 million a day to depict the bill as a job killer in television ads in the home districts of 26 wavering House Democrats. A new ad barrage from supporters of the legislation went up Tuesday in 11 districts, some overlapping. And unions are threatening some of those lawmakers to come through for Obama — or pay the price in the fall elections.

Obama has summoned members to the White House one by one for private, face-to-face persuasion, and also met larger groups. White House aides said he plans at least one more public health care event this week, including remarks in Fairfax, Va., on Friday. Diverse administration resources are being employed: Even the Navy secretary is in the game.

“We here in Congress are giving a new meaning to March madness,” Sen. Lisa Murkowski, R-Alaska, an opponent of the legislation, said Tuesday.