Yes, Obama is changing our Constitution, because he has a different opinion of what America should be. Obama believes that people need the government to tell them what is good for them. He believes that America owes debts and reparations to other nations. Obama believes the Constitution is too old and is irrelevant. He doesn't believe in it.
No Obama is not changing or constitution. If he could he would likely want to but there are some powers even he does not have. There are strict set ups for changing the constitution and congress will not currently allow him to do so in any way. It is a safeguard of our country.
The Constitution can't be changed by the Executive branch of the government in any way; the Constitution can only be amended by a convention or by the legislature, or by the decisions of the Supreme Court. Obama can't be changing the Constitution, and has not been doing so by the definition.
While President Obama might not be adhering to the Constitution, he isn't changing the document that Americans hold sacred. The president hasn't exactly protected the Constitution, but once again, he hasn't changed anything in the document. Many of the president's policies need to be reversed or modified to better fit the sacred document.
I don't think that anyone really believes that the President is changing the constitution. He has not amended anything and hasn't come close to doing it. This is just a talking point used by the right wing to discredit the President and lay more controversy at his feet. So, no he hasn't changed the constitution.
Obama is not changing our Constitution. The Constitution authorizes the President to propose and veto legislation. It does not authorize him to change existing laws. The changes Mr. Obama ordered in Obamacare, therefore, are unconstitutional. This means that he does not accept some of the limitations that the Constitution places on his actions. However, he will not be able to change the Constitution.
The Affordable Healthcare Act is not an effort to change the Constitution. The Constitution itself is a fixed document. The Bill of Rights and subsequent amendments, however, are working documents and meant to be changed, hence the word "amendment", which means "to amend or change." In this effect, yes, Obama is making changes to government documentation associated with the Constitution, though he is not actually changing the Constitution.