Being desperate to win doesn't disqualify them from committing treason.
No, but treason requires proof of intent. You have to prove that their motivation and intent was to harm US interests. Some legal analysts that I've read have also indicated that "treason" really requires a declaration of war, but that's up in the air (and really for Congress to decide).
As an example, if you steal money from the US government, that's not "treason" because your intent was to get rich. If you accept foreign donations, that's not "treason" because your intent was to win an election.
Even if it is treason, Congress prosecutes acts of treason, and do you really think that the GOP is going to go that far? Let's start with impeachment.
Yelling "treason" is going to (rightfully) get eye-rolls from conservatives. You'll engage them better by just saying "it's extremely criminal."
This is going to be a historic week.