Supporters of the unified charter are outspending opponents more than 20 to 1, according to county election records updated last week.
With strong backing from businesses, the pro-consolidation group We The People has raised $206,538.
One contributor alone, the economic development group Momentum, gave $100,000. Other large donors include Washington Trust Bank, Washington Water Power Co. and The Spokesman-Review, each of which gave $10,000 or more.