It seems that the DA is now facing a new challenge in the Western Cape.

The African Muslim Party (AMP) is no longer part of the of city's government after one of its members, with the approval of his party leadership, was found to have engaged in "secret talks" with the African National Congress (ANC), mayor Helen Zille said.

The AMP has three seats on the council, which means that should it join a coalition with the ANC and the Independent Democrats (ID), it will outnumber the remainder of the DA-led coalition.

The DA's coalition now has 103 seats, while the ANC, ID and AMP together have 106 seats. The Pan African Congress has one seat on the 210-member council.
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According to Zille, Chaaban had demanded that councillors from the city's coalition parties support him in his bid to become deputy mayor, threatening that his party would pull out of the coalition should he not get the necessary support.
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"We will not be blackmailed to stay in power," she (Helen Zille) said.

Read the full article, "Major blow for DA's Cape Town coalition" on M&G
I wonder what actions would be best for their constituency? It brings an interesting question to the fore:

If the best thing for their constituency is to remain in power, should you allow yourself to be blackmailed?

Obviously there is a big problem of being continually blackmailed if you allow it to happen once. I think I would have to say I agree with their current approach - I still have to sleep with myself when I go to bed at night, and it is all the small choices that contribute towards who we are.