Billionaire George Soros is committing $1 million to Priorities USA Action, the “super PAC” supporting President Barack Obama, two people with knowledge of the matter said Thursday, a significant donation that could help spur further contributions to the group in the closing weeks of the election campaign.

With just four weeks to go until the Republican primary season begins, Newt Gingrich spent his Monday not on the hustings of Iowa, New Hampshire, or South Carolina, but in Midtown Manhattan, prospecting for what his newly resurgent campaign needs most desperately: money.