Kansas City, Mo. ? Backers of a Jackson County election to fund millions of dollars in stadium improvements at the Truman Sports Complex might have a tough fight at the polls.

But they have come out ahead in one area: campaign spending.

Supporters of next Tuesday’s ballot measures – one for stadium improvements and one for a rolling roof that would land Kansas City the 2015 Super Bowl – have raised $1.55 million and spent $1.3 million in advance of the April 4 election.

Opponents have spent all of $501, according to the latest campaign finance reports filed with the Missouri Ethics Commission.

That’s a 2,613-to-1 spending advantage for the Save Our Stadiums campaign, which dominates the television airwaves with pleas to “save our teams.” But opponents say the Internet, where they have concentrated their efforts, has leveled the field.

The NFL’s Kansas City Chiefs and baseball’s Kansas City Royals have been the biggest donors to the pro-stadium campaigns, with the Royals giving $600,000 and the Chiefs $800,000.