…we first propose a new instrument for exposure to media bias to complement estimates based on news channel availability: the channel positions of news channels in cable television lineups. The channel position is the ordinal position of news channels in the cable lineup. The assertion is thus that the Fox News Channel will be watched more when it is channel position 25 instead of channel position 65. We demonstrate that a one-standard-deviation decrease in Fox News’s channel position is associated with an increase of approximately 2.5 minutes per week in time spent watching Fox News. We estimate that watching the Fox News Channel for this additional 2.5 minutes per week increases the vote share of the Republican presidential candidate by 0.3 percentage points among voters induced into watching by variation in channel position. The corresponding effect of watching MSNBC for 2.5 additional minutes per week is an imprecise zero.