RFK Jr's border visit puts Biden on notice, critics warn it would be 'stupid to write him off'

Democratic presidential candidate Robert F. Kennedy Jr. turned heads when he visited the southern border in Yuma, Ariz., earlier this week. 

To perhaps the angst of the Biden administration and other Democrats, RFK Jr. said he saw a "humanitarian crisis." 

"This is a humanitarian crisis because of the understanding across the globe that we now have an open border. There are people being drawn here. They're being abused…and this is not a good thing for our country. It's not a good thing for these people. And it is unsustainable," he...