Mayor Bloomberg supports pro-gun control platforms, donates $25,000 to Virginia state Senate candidates – Mayor Bloomberg is crossing state lines – and opening his wallet – in his latest salvo in his war to keep guns off city streets.  Bloomberg has donated $25,000 apiece to the campaigns of six Democratic candidates for the Virginia state Senate who share his strict beliefs on gun control, officials told the Daily News Friday.   The deep-pocketed mayor, who drew the ire of the Virginia attorney general when he ran gun stings there five years ago, will travel to Old Dominion to campaign for the candidates next week, the officials said.  What happens in the Virginia Legislature will directly affect the public safety of New Yorkers, said John Feinblatt, the mayor s Criminal Justice Coordinator.