As of today the United States remains pretty much a Nation of Laws, . . . although poor old DonDiego notes some folks ignoring federal Regulations and even the Constitution to the extent they can get away with it. Nonetheless, "sedition" and "treason" are defined within the US Code:
18 U.S. Code § 2384 - Seditious conspiracy:
If two or more persons in any State or Territory, or in any place subject to the jurisdiction of the United States, conspire to overthrow, put down, or to destroy by force the Government of the United States, or to levy war against them, or to oppose by force the authority thereof, or by force to prevent, hinder, or delay the execution of any law of the United States, or by force to seize, take, or possess any property of the United States contrary to the authority thereof, they shall each be fined under this title or imprisoned not more than twenty years, or both.
18 U.S. Code § 2381 - Treason:
Whoever, owing allegiance to the United States, levies war against them or adheres to their enemies, giving them aid and comfort within the United States or elsewhere, is guilty of treason and shall suffer death, or shall be imprisoned not less than five years and fined under this title but not less than $10,000; and shall be incapable of holding any office under the United States.
DonDiego hasn't seen either of these crimes committed lately. If these crimes ever do transpire, . . . poor old DonDiego hopes he's too old to hafta pick a side, and they jes' leave him alone.
***EDITED TO ADD***
Re: The Logan Act
"The clear intent of this provision [Logan Act] is to prohibit unauthorized persons from intervening in dispute between the United States and foreign governments. Nothing in § 953, however, would appear to restrict members of the Congress from engaging in discussions with foreign officials in pursuance of their legislative duties under the Constitution. . . ."
Ref: Department of State comment in Digest of United States Practice in International Law 1975, page 750
If the Logan Act didn't stick when Senators McGovern and Sparkman visited Cuba in 1975, it's unlikely to sitck in 2014 against the House of Representatives.
A brief history of the Logan Act and the general practice of not enforcing it can be found at Conducting Foreign Relations without Authority