We may live in the land of Lincoln, but where is the party of Lincoln?

There is an excellent article about President Abraham Lincoln at CNN entitled, "We all live in the Land of Lincoln." President Abraham Lincoln​ is one of my favorite presidents. I found this to be a good article about his impact on US history. Ironically, I have heard many conservatives today claim Lincoln was a bad president because the Southern states had a right to leave the Union, and Lincoln suspended the right of Habeas Corpus. This is ironic because such conservatives tend to vote for Republican candidates. I argue that three items from the US Constitution may explain Lincoln's reasoning on these matters, which was the heritage of the Republican Party:

Article VI states: "This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding."
- Lincoln understood that the US Constitution, not a state in the Union, is the supreme law of the land. When the original 13 states ratified the Constitution, they made it the sovereign of the land. When a state joins the union, it makes the US Constitution the sovereign, the supreme law of the land.

Article IV, Section 3 states: "New States may be admitted by the Congress into this Union; but no new State shall be formed or erected within the Jurisdiction of any other State; nor any State be formed by the Junction of two or more States, or Parts of States, without the Consent of the Legislatures of the States concerned as well as of the Congress."
- States cannot change their borders without the consent of Congress. Leaving the Union in effect changes the borders of sovereignty. The Confederacy was a confederation of rebellious states.

Article I, section 9 of the US Constitution states: "The Privilege of the Writ of Habeas Corpus shall not be suspended, unless when in Cases of Rebellion or Invasion the public Safety may require it."
- Lincoln suspended the right of Habeas Corpus because the Civil War was a war of rebellion.

Originally, the Republican party was the national party, whereas the Democratic party was the states-rights party. It is ironic that today many Republicans talk more like states-rights Democrats in the mode of Jefferson Davis, the president of the Confederacy.

So, what happened to the real Republican Party? Why are Lincoln Republicans called RINOS (Republicans In Name Only)? Where is that party of civil rights and national unity? Why have so many Republicans become states-rights advocates much in the way of the old Dixiecrat wing of the Democratic Party?

And concerning the upcoming presidential election, who represents the Lincoln wing of the Republican Party today among those running for president?