Washington (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 Ob … Read More