Democrats, Sen. Tammy Baldwin and Reps. Gwen Moore, Mark Pocan and Ron Kind, want the Justice Dept. to recognize the marriages for federal purposes.
Those would include allowing the couples to file joint federal tax returns. In addition, spouses of federal workers and soldiers would qualify for federal benefits, such as health care.
The four Wisconsin leaders sent their request to Attorney General Eric Holder via letter.
Earlier this month, more than 500 same-sex couples married, after U.S. District Judge Barbara Crabb struck down Wisconsin's ban on same-sex marriage. However, this past Friday, she put her ruling on hold, while state Attorney General J.B. Van Hollen appeals the case. Additional weddings then stopped.
Now some of the recently-married are seeking clarification about legal matters related to their license.
In addition, there are reports in Outagamie County that some same-sex couples who paid a $100 application fee for a marriage license - but had to adhere to a five-day waiting period before marrying, are demanding a refund.
The county initially told them it would only return about half, the state portion, but later Monday, officials announced they would issue full refunds.