Sen. Jon Tester more than tripled his GOP opponent's most recent fundraising haul. Polling still shows him losing.Anna Moneymaker/Getty ImagesDemocrats have been raising way more cash than their GOP opponents in competitive Senate races.But they're still facing a punishing map, and no amount of money can fix that.Plus, self-funding by rich candidates and spending by super PACs have helped the GOP catch up.Ahead of the closing stretch of the 2024 campaign, Democratic incumbents and candidates in the country's nine competitive Senate races have been crushing their GOP opponents in fundraising, raising four times as much money in a handful of cases.But Democrats still appear likely to lose their current 51-vote majority, no matter who wins the presidential election.