Voting in another party's primary to intentionally nominate a weaker candidate is known

It is known as crossover voting.

Explanation:

In crossover voting, some voters decided to cast votes in the primary of the opposing party, that is, the party they are not affiliated with.

This act is usually intentionally carried out.

The intention could be to

* prevent one of the nominated candidate in the opposing party, which they dislike from winning.

* stop an opposing candidate which they see as a threat to their party from winning the primary.

party raiding/ party crashing

Explanation:

it is a strategy for voting weaker candidates in another party's primary with the expectation that the opposite party might nominate a candidate who is much easier to beat in general elections.

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