Don’t forget the Senate’s role in all this. Part of the charm of the 2-house system is that it allows members to cast votes on this amendment or that, or even on entire bills, strictly for the sake of building up a voting resume for the next election, without fear that the particular amendment or bill will actually become law. On the particular bills you’ve mentioned, the positions being put forward by the Democratic-controlled Senate on these PR-based votes are in sharp contrast to those passed by the GOP-controlled house.
So don’t be misled by House GOP moderates in conservative-leaning districts, casting conservative-looking votes. If they truly had to consider that these votes were meaningful, many of them would be different.
The “hugeness” of the tax cut is debatable, too, since it doesn’t really kick in for the wealthy until long after the next Presidential election, a point in time no economist can accurately forecast. It wasn’t as hard for people on both sides of the aisle to vote to bribe the electorate as it might appear. Politically, though, it made the economy Bush’s responsibility instead of Clinton’s for the next campaign cycle, and the economy is still stagnating. When the (inevitable) question “Are you better off now than you were four years ago?” gets asked in 2004, the answer has a very good chance of being “No”, and the blame will be Bush’s. So I don’t see this as entirely a triumph for the GOP, either.
You suggested in the OP that Bush is an “extremely skilled politician”. Let me ask: Whose “fault” is it that his party lost control of the Senate, and thereby control of the legislative agenda (that is, the stuff that gets enacted, not just voted on by one House)? How could an “extremely skilled politician” have not understood the consequences of his treatment of every person in a minuscule voting margin? His claim to effectiveness lies on his people skills - is that an example?
Let me also ask: Does Bush face the same campaign of personal destruction that faced Clinton, and still does for that matter? Is part of his “luck” simply a greater level of responsibility and simple maturity on the part of his opposition than on Clinton’s?
All that doesn’t even get into how much direction Bush himself gives his administration compared to Cheney, Rove, Rice, and Powell. I don’t see him as being any less a befuddled, manipulated figurehead than Reagan was, except that the real power is held by more responsible (for the most part) people than in Reagan’s administration.
So my short answer is: Lucky. So far.