AUGUSTA, Me. — With Republicans in complete control of Maine’s state government for the first time since 1962, State Senator Lois A. Snowe-Mello offered a bill in February to limit doctors’ liability that she was sure the powerful doctors’ lobby would cheer. Instead, it asked her to shelve the measure.

“It was like a slap in the face,” said Ms. Snowe-Mello, who describes herself as a conservative Republican. “The doctors in this state are increasingly going left.”

Doctors were once overwhelmingly male and usually owned their own practices. They generally favored lower taxes and regularly fought lawyers to restrict patient lawsuits. Ronald Reagan came to national political prominence in part by railing against “socialized medicine” on doctors’ behalf.

But doctors are changing. They are abandoning their own practices and taking salaried jobs in hospitals, particularly in the North, but increasingly in the South as well. Half of all younger doctors are women, and that share is likely to grow.