Politico reports [politico.com] on a data theft from the National Republican Congressional Committee (NRCC) by former employees who now work for the National Republican Senatorial Committee (NRSC):
Staffers for Senate Republicans’ campaign arm seized information on more than 200,000 donors from the House GOP campaign committee over several months this year by breaking into its computer system, three sources with knowledge of the breach told POLITICO.
[...]
Multiple NRSC staffers, who previously worked for the NRCC, used old database login information to gain access to House Republicans’ donor lists this year.