Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Secretive Political Lobbying Groups Target Battle Over Supreme Court Vacancy Masood Farivar WASHINGTON - Well-funded, secretive political groups are getting into the high-stakes battle over filling a U.S. Supreme Court vacancy created by the death of Justice Ruth Bader Ginsburg. Known as "dark money" groups because they aren't required by law to disclose the names of their donors, these influential organizations are pumping millions of dollars into advertising campaigns to influence voter perceptions of what is expected to be one of the most contentious confirmation hearings in modern American history. Just hours after Ginsburg, the 87-year-old liberal icon, died of cancer last Friday, Demand Justice, a progressive dark money group with ties to the Democratic Party, said it would spend $10 million to challenge President Donald Trump's push to quickly replace Ginsburg with a conservative jurist. The group's conservative counterpart, Judicial Crisis Network, quickly responded by launching a $2.2 million advertising campaign to support Trump's push, with the goal of eventually matching or exceeding spending by Demand Justice. Judicial Crisis Network previously pledged to spend $20 million to help confirm Trump's first two Supreme Court justices, Neil Gorsuch and Brett Kavanaugh, according to the Center for Responsive Politics, a political finance watchdog. Spokespeople for Judicial Crisis Network and Demand Justice confirmed their new spending plans to VOA. Trump plans to announce his choice of a conservative female jurist to succeed Ginsburg on Saturday, with Amy Coney Barrett, a judge on the U.S. Court of Appeals for the 7th District, and Barbara Lagoa, a federal appeals court judge for the 11th District, among the leading contenders. Early this week, Trump lined up sufficient Republican support in the Senate to confirm his choice before the November 3 election. .