Why are Senate Republicans scrambling to pass a hastily rewritten tax bill that most Americans don't even like? Think of it as the mirror image of what Democrats did seven years ago with the Affordable Care Act. When it's a core issue for your party — as tax cuts are to Republicans, health care was to Democrats — you'd better be able to pass it.
The bottom line: When Republicans control the White House and both chambers of Congress, it would be hard to explain why they couldn't pass a rewrite of the tax code — every bit as central to their agenda as health care was to the Democrats when they controlled the White House and Congress. The details, and the polling, are almost beside the point.