On the other side, Sen. Orrin Hatch of Utah, the top Republican on the Health, Education, Labor and Pensions Committee, told CNN on Tuesday that he thinks "we're going to keep the committee staff" on the current federal employee plan.
"I haven't made up my mind," Hatch said.
Democrats are similarly split.
Senate Budget Committee Chairman Patty Murray, D-Wash., will have her leadership and committee staff go into the exchange.
But what about fellow Democrat and Finance Committee Chairman Max Baucus of Montana? His office says he believes committee staff is exempt.
The issue is a double-edged sword for lawmakers: exempt your staff and face accusations of granting them a special privilege or force your staff into the exchanges and risk losing good workers who fear the exchanges will provide weaker or costlier benefits.
Many of the most powerful waited until this week to make the tough decision. House Republican leaders were still discussing options on Tuesday.
Then by Wednesday, Speaker John Boehner and his top lieutenants decided to put their leadership staff into the exchanges, according to spokesmen for the various leaders.
Senate Democratic leaders may be less united.
While Murray and Democratic Whip Richard Durbin, D-Illinois, are both forcing their entire staff into the exchanges, Senate Leader Harry Reid's office did not answer CNN's questions about his plan.
As for staffers themselves, feelings about joining the exchanges range from "meh" to sharp anxiety.
None would speak on the record with CNN, saying they were not authorized to discuss their opinions with reporters.
But several aides said they were extremely nervous about the exchange idea because it was untried.
One indicated he had started thinking of looking for a new job because of the predicament.
Others insisted they either had not thought about the exchange idea much or felt that it would be similar to the federal health plan they have now.
To try to and guarantee a plan equal to current federal benefits, the Office of Personnel Management requires that congressional staffers in the exchange buy a plan at the "gold" benefit level or above.
The same rule also mandates that congressional staffers use the Washington, D.C., health exchange to find a plan.
Those rules will apply to some staffers and not others, depending on how individual members of Congress decide, one-by-one.