The Supreme Court on Tuesday reaffirmed the limits on contributions that political parties can raise, and rejected a challenge by the Republican Party that the restrictions violated free-speech rights.

The justices sided with the Obama administration and affirmed a ruling that upheld the limits, a cornerstone of the 2002 federal campaign finance law designed to regulate the influence of money in politics.

Republican Party attorneys had sought to end the limits and cited the Supreme Court's ruling in January that corporations can spend freely to support or oppose candidates for president and Congress.

That decision has been denounced by President Barack Obama for turning loose a flood of special-interest money into the U.S. political system before the November congressional elections, when Democratic control of Congress is in jeopardy.

It also has provoked efforts by Democrats in Congress to adopt legislation to blunt the impact of the ruling and has become a major issue at the Senate confirmation hearings for Elena Kagan, who Obama has nominated to the Supreme Court.