ST. LOUIS (AP) - A white couple pointed guns at protesters in St. Louis as a group marched toward the mayor's home to demand her resignation.A social media video showed the armed couple standing outside of their large home Sunday evening in the upscale Central West End neighborhood of the Missouri city.In the video, the unidentified couple shouted at protesters, while people in the march moved the crowd forward, urging participants to ignore them.It wasn't immediately clear whether St.