WRT the 2000 election, Greg is correct that the SCOTUS cases addressed a narrow aspect of the overall controversy. However, it seems to me that the ultimate result is undisputable (even in theory), since during the controversy, Florida's legislature voted to send to the Electoral College, those electors which had been determined as a result of the certified election, and the U.S. Constitution specifies that a State's electors shall be determined "in such a manner as the legislature thereof may direct" (Article II, Section 1).
So, from a perspective of the extent to which the federal government, and SCOTUS, can be legitimately concerned, it was entirely the Florida legislature's prerogative, to decide its State's choice of who should be the U.S. President, and this was in fact done, and thus it cannot reasonably be argued that "Bush was selected [by a 'conservative Supreme Court'], not elected."
BTW, n0mad23 is correct that GW Bush was not the first person to become U.S. President after having arguably not won the popular vote. Bush was, however, the first such President to have been subsequently reelected to a second term.
Also btw, I did a research paper on the Electoral College, shortly after the 2000 election and, among the various things that I found, are that people have been arguing almost since the beginning of the USA, seeking to abolish or at least modify the Electoral College system, that there have been more proposed Constitutional Amendments, on this subject, than on any other, and that the various arguments on behalf of such proposals, are always the same.
I would add that Andy44 is correct, in identifying the basic purpose of the Electoral College, which is to ensure that a candidate for the U.S. Presidency, must concern himself with all the diverse interests in a diverse nation, and not merely the interests of a popular majority. The alternative would be, in the words of one of my source authors, "a recipe for civil war."