Under pressure from the health care industry and consumer advocates, seven Republican governors are cautiously moving to expand Medicaid, giving an unexpected boost to President Obama’s plan to insure some 30 million more Americans.

The Supreme Court ruled last year that expanding Medicaid to include many more low-income people was an option under the new federal health care law, not a requirement, tossing the decision to the states and touching off battles in many capitols.

The federal government will pay the entire cost of covering newly eligible beneficiaries from 2014 to 2016, and 90 percent or more later. But many Republican governors and lawmakers immediately questioned whether that commitment would last, and whether increased spending on Medicaid makes sense, given the size of the federal budget deficit. Some flatly declared they would not consider it.

In Florida, where Gov. Rick Scott reversed his position and on Wednesday announced his support for expanding Medicaid, proponents say that doing so will not only save lives, but also create jobs and stimulate the economy. Similar arguments have swayed the Republican governors of Arizona, Michigan, Nevada, New Mexico, North Dakota and Ohio, who in recent months have announced their intention to expand Medicaid.