MILWAUKEE — Wisconsin gubernatorial candidates David Crowley and Tom Tiffany offered sharply different positions on abortion access during campaign stops in southeastern Wisconsin on Tuesday, four weeks before Election Day. Crowley, the Democratic candidate, proposed amending the state constitution to protect abortion access. He said at a Milwaukee event with U.S. Sen. Tammy Baldwin that decisions about care should be made by patients and health care providers, not politicians. The proposal would not take effect through a governor’s order. A constitutional amendment must pass the state Legislature in two consecutive sessions before it can go to voters. Crowley did not specify how his proposed amendment would interact with existing abortion restrictions. Tiffany, the Republican candidate, said at an event in Germantown that he would maintain Wisconsin’s current law. He said he supported an abortion restriction while serving in the state Legislature and would uphold the law as governor. Tiffany has also backed stricter abortion proposals as a member of Congress. The account of Tiffany’s remarks described his earlier vote as being for a five-week ban, while identifying Wisconsin’s current restriction as a ban on abortions after 20 weeks. The difference between those descriptions was not clarified. Crowley’s proposal follows a lawsuit by Planned Parenthood of Wisconsin challenging several state abortion laws and asking a judge to recognize a constitutional right to abortion in Wisconsin. The competing positions put state abortion policy before voters as the candidates campaign for governor.