It's not by the general standards of this country.
There have been fewer than 40 treason prosectutions in the history of the country. Not a single Confederate was ever prosecuted for treason.
And it generally requires active action (you'd have to have a Congressman secretly forwarding intel from some classified briefing directly to Zawahiri or something) not merely criticizing a war or the actions of US troops.
People need to give up on the fantasy of prosecuting any Democrats for treason. It's sort of silly and just looks nutty. You can criticize them all you want of course.
I know it's not treason. It's just fun to think it is. It is closer to sedition.
"Not a single Confederate was ever prosecuted for treason"
It's interesting that to be prosecuted for treason, you must be a citizen of the US. Citizens of the CSA were not US citizens so they couldn't be prosecuted for making defensive war on the US.
"(you'd have to have a Congressman secretly forwarding intel from some classified briefing directly to Zawahiri or something)"
I suggest you read up on a fellow by the name of Vallandigham during the Civil War.
Government is the least effective, least efficient means to do anything. Protecting our borders, prosecuting and preventing crimes are examples of how well government accomplishes its only legitimate function.
With that said, think back to 1996 and Bill Clinton. There was compelling evidence that Clinton transfered strategic intel to a foreign nation that was and is clearly a serious potential enemy of the United States in exchange for contributions that helped him win the 1996 election. Even if Clinton were found not guilty of the crimes that appear to have been committed, it cannot be disputed that he allowed the transfer of technology (super computers) to Red China. And without super computers much of the other acquired technology (gps missle warhead targeting and nuclear weapons testing modeling) would effectively be useless.
Your arguments don't prove that Democrats haven't committed treason, only that government can't do anything very well. As President Reagan said, "Government isn't the solution; government is the problem." I would add that most of the problems caused by government are actually initiated by Democrats and their willing accomplices in the media. Senator McCarthy was right; it was the Democrats and the media that got it wrong.
One other thing: "Not a single Confederate was ever prosecuted for treason."
When wars are fought, the winners get to write the history, as opposed to "right" the history. Historians called it the "War Between the States" or the "Civil War". In reality, it was actually a war between two separate nations. You obviously can't distinguish the difference. If you actually understood the Declaration of Independence and the Constitution of the United States, you might have known enough to keep your mouth shut instead of having removed all doubt.