George Soros, the liberal billionaire investor who has largely laid low during the 2012 election campaign, announced $1.5 million in pledged donations Thursday to a trio of super PACs backing President Obama and congressional Democrats, PAC officials said.

Soros, who became nationally prominent in 2004 when he spent more than $20 million on independent groups supporting Sen. John Kerry (D-Mass.), will give $1 million to Priorities USA Action -- which is supporting Obama -- and $500,000 to Majority PAC and House Majority PAC, which are running ads on behalf of Democratic candidates for Congress.

The move could signal a softening of resistance by Soros and other wealthy liberals to contribute to super PACs and other independent groups that can accept unlimited donations.

Read the whole story.