Bush made several mistakes and was a poor President. After his terms were finished, the nation elected Obama.
That pretty much sums it all up in a nutshell.
Two complete seperate situations. Furthermore, Obama was a much better candidate on all levels, with even more so when taking a look at the intangibles of the 24/7 news media and money raised via the two parties on those given election years. Not too mention the GOP base was much more adult in their outlook and understanding in 1988 than they are today....
Being willing to be intellectually honest about the reality of those two elections sums things up much better than your lack of doing so, with regard to your "nutshell" overview.
The Reagan record that I listed stands and no way today would GWB have got by with doing any of those things. On the record of big issues, GWB was more conservative than Reagan on many levels. Especially in terms of the courts, Defense, taxes and soc security...