In this article we examine the presence of bias in Chile's two main daily newspapers, El Mercurio and La Tercera, both of which have historically been associated with the political right. We analyse their principal headlines in the first 100 days of rule of presidents Eduardo Frei (1994-2000), Ricardo Lagos (2000-2006), Michelle Bachelet (2006-2010) and Sebastian Pinera (2010-2014). We find that La Tercera was more critical of all these presidents than El Mercurio. In La Tercera we also identify an ideological bias in favour of Pinera as compared to the centre-left presidents, and in El Mercurio a greater bias against Bachelet than the other presidents.