In Wisconsin, conservative and pro-business groups said Friday that they were considering a lawsuit to block a proposed law that would ban corporate spending during political campaigns.

In Kentucky and Colorado, lawmakers looked for provisions in their state constitutions that may need to be rewritten. And in Texas, lawyers for Tom DeLay, the former House majority leader, said the pending state campaign finance case against him should be thrown out.

A day after the United States Supreme Court ruled that the federal government may not ban political spending by corporations or unions in candidate elections, officials across the country were rushing to cope with the fallout, as laws in 24 states were directly or indirectly called into question by the ruling.

“One day the Constitution of Colorado is the highest law of the state,” said Robert F. Williams, a law professor at Rutgers University. “The next day it’s wastepaper.”