Watch Live: Kamala Harris addresses teachers union in Houston

Vice President Kamala Harris is delivering the keynote address to the American Federation of Teachers in Houston, Texas, on Thursday, after stops in Indianapolis and Milwaukee earlier this week. 

It's been four days since President Biden announced he's dropping out of the race for president and then endorsed Harris, sending American politics into an upheaval of historic proportions. Since then, Harris has been locking up Democratic support and endorsements and vying for votes across the country. 

As Harris hits the campaign trail this week, her campaign on Thursday released its first campaign video on social media.