Obama center-right?  What are you considering center?  Full blown communism? 

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Most of Obama's policies were indistinguishable from Reagan's.  In fact, in several areas, he was to the right of Ronald Reagan.  He deported more people than any other President in US history, where Reagan gave an amnesty.  Despite a growing number of states legalizing marijuana and wanting to treat it as a health issue rather than a crime issue, Obama radically strengthened enforcement of Federal marijuana and other drug laws, far beyond even Reagan's 'war on drugs' spending.  Obama's neo-liberal foreign policy was nearly indistinguishable from that of Reagan or the Bushes, he just had drones to use rather than having to insert the CIA and special forces and it was the Middle East rather than Central America.

American politics isn't real politics.  On a whole raft of issues revolving around the U.S.'s corporate capitalist system, establishment Democrats and establishment Republicans hold identical positions.  The two parties just line up on either side of a raft of social issues like abortion, guns, etc. in order to give a portion of the populace a reason to vote for one over the other.  But if you look at politics in Europe...or anywhere else in the world really...you see an actual array of parties representing positions from far left to far right and everywhere in between.

Have you ever thought about why it is that if I find out your opinion on gun control, I can predict with 95% certainty your position on abortion, climate change, gay rights, health care, etc. etc. etc.  These issues aren't actually related.  But for a few decades now, the American public has been sold this idea that there are only two teams in the game and you have to pick one.  The other guys are then a bunch of bums.  Its politics as team sports.  And somewhere lost in the shuffle is the idea that maybe the instruments of government could actually be used to make the lives of real people better.

Being the opposition used to be honorable. Debating, in earnest, toward the goal of benefiting the country was normal US politics. Somewhere along the way, thanks Newt, it became divisive. The absolute worst thing to happen in the GOP is the constituencies complete lack of desire to hold their leaders accountable. I have yet to hear any GOP supporter get angry about how their party abuses power. Might does not make right, but they won't see that until they are on the short end of the stick. If a tape of a conversation between Putin and Trump surfaced where Trump said he would do whatever Putin wanted, I dare say members of the Republican party would spin it as "acting in our best interests" instead of treason. When and if the Mueller report shows Russia's interests being put ahead of American interests we will surely see forgiveness and spin that puts the activity in a positive light. There are many GOP supporters that view splitting up families, treason and destruction of the middle class as the price you pay for a conservative majority Supreme Court. That it is somehow acceptable and that the end justify the means.

It takes a special kind of ignorance to think a large wall will be more effective than a fence, cutting taxes on the rich will eventually put money in the pockets of the middle class, that people are welfare are living the good life or that a safe world is one where every man, woman and child carries a gun. That level of ignorance resides exclusively in the current form of the GOP.

The Clinton family was investigated all the way down to the Pizza Parlor level to find the childr rape/trafficking ring. How can you say it wasn't extensive? All jokes aside, count up the number of investigations, agencies/organization that performed them and the number of days for each and compare them, Clinton to Trump, and then we can compare apples to apples for the abuse of power discussion. Remember, this supposed abuse of  power is coming during a two year period of GOP controlled White House, Upper and Lower Congress. So who was abusing the power?

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When the head of the FBI announced pre-election that the Bureau was re-opening a case into Hillary but kept quiet that they were also investigating the Trump campaign, we can see that things are not really as you describe above.

As for Donald Jr's meeting turning out to be nothing... He thought it was something. His emails show he was delighted at the opportunity to collude. He is therefore not absolved.