Rob Lowe said he deleted his tweet mocking newly minted presidential candidate, Elizabeth Warren, over her past claims of Native American ancestry. In case you missed it, it said that the Massachusetts senator entering the race “would bring a whole new meaning to Commander in ‘Chief.’” He apologized with, “It was a joke and some peeps got upset, and that’s never my intention,” adding, “On the GOOD side: I just got to use the Oxford comma!” For the record, he didn’t use an Oxford comma, which appears in a list of three or more items separated by commas.