3-point contest George Floyd’s ex, Roxie Washington, is backing Kamala Harris’ VP pick, telling TMZ … she’s not buying the backlash against Minnesota Gov. Tim Walz for the 2020 BLM riots over George’s murder. FOLLOW ALL TMZ PODCASTS: https://www.audio.tmz.com/ About TMZ: TMZ has consistently been credited for breaking the biggest stories dominating the entertainment news…