criticism since warning last week that russian hackers had, quote, penetrated some of his state s county voting systems. it turns out he was not making things up. nelson is in a tough race for re-election in florida against republican governor rick scott who suggested there wasn t evidence to nelson s claim and blasted nelson as irresponsible. the top florida elections official, also republican, said he had seen no indication nelson s claim was true. the florida secretary of state and president of the florida state association of supervisors of elections wrote to nelson yesterday that we are aware of the threat and the need to stay vigilant, but if you have specific information on a confirmed intrusion, we urgently need you to disclose that information to us so we can take action. but now three people familiar with the intelligence tell nbc news s ken dilanian that there is a classified basis for nelson s assertion. they say nelson was talking about intelligence related to