(CNN) -- Democratic National Committee Chairman Tim Kaine is planning to announce he will run in 2012 for the Virginia U.S. Senate seat currently held by fellow Democrat Jim Webb, who is retiring, two senior Democratic sources told CNN on Sunday.
One source said Kaine's announcement will come in the next two weeks.
President Barack Obama has publicly prodded Kaine, a former Virginia governor, to run for the seat, which is in a state Obama won in 2008 and needs to hold onto in his re-election bid.
Democrats currently control a 53-47 majority in the Senate and will have 23 of their seats contested in 2012, compared to 10 Republican seats.