Perhaps an example might serve as a better explanation of what I am thinking:
Trello is a real company with a product that is agnostic. Politicians of any school of though can use their products to great effect. They benefit from everyone using this product, including, perhaps, their competitors and opposition.
If, on the other hand, each political party hires a passionate coder to create their own kanban board software they are very likely to end-up with a bunch of suboptimal solutions.
In other words, if they can, if the nature of the software allows, it would benefit them to look for universal providers rather than party-aligned providers. If you can trust Trello with your political party data you can then trust a similar company with other data you might produce with their software.
I guess it comes down to the software. What kinds of things are they doing that requires custom tools that have to be written specifically for one party?
* There are types of software that are politics-specific, and therefore do not exist until a party pays for it to be made.
* Politics is a zero-sum game: if you're funding software (either institutionally, or by being a tech worker who works below market wage For The Cause), you don't want it to be used by your political opponents.
So commodity stuff that already exists is bipartisan. Any application that is specific to political campaigning is highly partisan.
[1] There's also a secondary issue of data security for cloud products; parties maintain extensive voter files with things like past voting history, up-to-date contact information, and past contacts [1a]. They do not want this information falling into the hands of the opposing party, and so don't want their data touching any organization that might potentially have cross-partisan ties, or godforbid might have cotenancy for D and R data.
[1a] This is basically the king of all CRMs, and these days they might be able to reimplement it as a bunch of plugins on top of a commercial provider like Salesforce, but those only became available relatively recently, data migration would be nontrivial, and there's a substantial amount of politics-specific functionality that would need to be rewritten as plugins.
