The Supreme Court may be about to radically change politics by striking down the longstanding rule that says corporations cannot spend directly on federal elections. If the floodgates open, money from big business could overwhelm the electoral process, as well as the making of laws on issues like tax policy and bank regulation.

The court, which is scheduled to hear arguments on this issue on Wednesday, is rushing to decide a monumental question at breakneck speed and seems willing to throw established precedents and judicial modesty out the window.

Corporations and unions have been prohibited from spending their money on federal campaigns since 1947, and corporate contributions have been barred since 1907. States have barred corporate expenditures since the late 1800s. These laws are very much needed today. In the 2008 election cycle, Fortune 100 companies alone had combined revenues of $13.1 trillion and profits of $605 billion. That dwarfs the $1.5 billion that Federal Election Commission-registered political parties spent during the same election period, or the $1.2 billion spent by federal political action committees.

The Supreme Court has repeatedly upheld the limitations on corporate campaign expenditures. In 1990, in Austin v. Michigan Chamber of Commerce, and again in 2003, in McConnell v. Federal Election Commission, it made clear that Congress was acting within its authority and that the restrictions are consistent with the First Amendment.