indicates that the polling firm usually or always conducts polls via live interviewers who place calls to cellphones in addition to landlines. Firms that place live-interview calls to cellphones but blend them with another technique (e.g., automated calls to cellphones) are not included in this category. indicates that a firm conducts its polls at least in part via live interviewers who place calls to cellphones in addition to landlines, but may blend them with another technique or conduct other types of polls that are not live-caller polls. As a default, we assume that a polling firm has not begun to include cellphones in its samples until we have evidence to the contrary. Firms that conduct surveys via text messages to mobile devices are not included. (Only phone calls qualify.) Pollsters that have routinely begun to include cellphones in their samples but are not listed as such should contact FiveThirtyEight. Information is as of May 18, 2020.