Setting aside their differences to combat the threat of Turkey becoming an Islamic state.
From the BBC, with thanks to Davida:
Two secularist opposition parties in Turkey are joining forces to challenge the Islamist-rooted ruling AK Party in the July general election.
The alliance was announced at a news conference on Thursday by the Republican People’s Party (CHP) and Democratic Left Party (DSP).
The 22 July election was brought forward from November to try to resolve a dispute over the Turkish presidency.
Secularists accuse the AKP of trying to pursue an Islamist agenda.