From Guns.com:

Biden, a Pennsylvania-born former U.S. Senator from Delaware and the presumptive Democratic nominee, selected Harris this week after months of rumors that his campaign was in talks with the sitting first-term California senator. The news was greeted with applause by national gun control organizations such as the Brady Campaign, Giffords, and Michael Bloomberg’s Everytown group, with the latter expected to chip in $60 million to this year’s elections.