I'd beg to differ. Politicians who intend to cut taxes generally do so to curry favor with voters before the election. There's no reason to wait until afterwards unless, of course, they anticipate their decision will be unpopular -- or, in other words, that they intend to impose a heaping helping of new taxes on Americans.
Remarkably, Senator Harkin predicts that the issue will be confronted in the Congress' lame-duck sessions, after the elections. As I've argued before, deliberately postponing important legislative decisions until after there is a realistic chance of electoral accountability for them is a sleazy tactic, and deeply corrosive of democratic governance.