WASHINGTON (AP) — A long-shot Senate Democratic effort to raise the federal minimum wage seemed all but doomed Tuesday when a moderate Republican lawmaker viewed as a potential supporter said she expects to oppose the measure.

That election-year bill, on which the Senate is expected to vote Wednesday, would gradually raise the current $7.25 hourly minimum to $10.10 over 30 months. It will need GOP votes to overcome a procedural blockade by most Republican senators, who say the measure would be too costly for employers.