Can I add a field to the admin for an excerpt? If not, how can I get the excerpt from the relevant page or the "before the flip" text from the relevant blog post?
Official response from NationBuilder Support
You can add an excerpt to a featured content slider under the "Headline / Action text" field on any page in your nation that contains a content slider under Settings > Featured content sliders.
The liquid variable, "{{ post.blog_post.content }}" will display the content of a specified blog post in the "before the flip" area. Please see our Liquid Object Reference Index and guide to use Liquid with NationBuilder for more information.
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{% if feature.page.type_name == 'Blog Post' %} {{ feature.page.blog_post.content | truncatewords:20 }} {% else %} {{ feature.page.excerpt | truncatewords:20 }} {% endif %}