There are many nightmare scenarios out there about what could happen on election day. An electoral college tie. An electronic voting glitch in a state that has moved to a new voting system. A call for a recount in a state like Ohio that still uses punch cards. A disruption by a terrorist group. Thinking about such scenarios is fair game after the 2000 debacle, in which the outcome was decided in mid-December after intervention by the U.S. Supreme Court.

One scenario that deserves more attention involves Colorado.

On Nov. 2, Coloradoans will be doing more than voting for president. They will also consider Amendment 36, a voter initiative that, if passed, will change the way Colorado's nine electoral votes are allocated.

Most states, including Colorado, award all of the state's electoral votes to whichever presidential candidate obtains the greatest number of votes there. Amendment 36, if passed, would divide up Colorado's electoral college votes proportionately, depending on how many votes each candidate wins.

What's more, it declares unambiguously that "the popular proportional selection for presidential election is intended to apply retroactively and thus determine the manner in which our state's presidential electors are chosen and our state's electoral votes are cast for the general election of 2004."

In other words, if George Bush narrowly gains more votes than John Kerry (right now, things look like a tossup), Bush could end up with only four or five electoral votes rather than nine. (It is certainly possible that Ralph Nader could get enough support to gain one electoral vote under this system, and Amendment 36 provides rounding rules to deal with issues of allocating the votes.)

Put aside for a moment the question of whether this is a desirable new law. And put aside the question of whether it will help Kerry or Bush.

The more important point is this: With such a close race nationally, the results of the nationwide election could well turn on a judicial determination of whether Amendment 36 applies (or on exactly how it applies, if there are ambiguities). Bush won the last election, don't forget, by only five electoral votes.

That is where the Colorado nightmare could begin.

We can start with the simplest way that things can go wrong: The vote on Amendment 36 could be very close, and there might need to be a recount of votes, throwing the entire national election into dispute.

Second, opponents of Amendment 36 could go to court claiming that it is unfair and unlawful to apply Amendment 36 retroactively to this election. This argument seems doubtful because there is no unfair surprise here.

The most interesting and trickiest legal question has to do with Article II of the U.S. Constitution, which allows each state legislature to set the rules under which electors are chosen and allocated. When the U.S. Supreme Court was considering the 2000 Florida controversy, supporters of Bush argued that the Florida Supreme Court, in extending the deadline for Al Gore to contest the election and later by ordering a recount, had violated Article II. The argument was that the court had usurped the legislature's power.

In its first decision in the Florida controversy, the U.S. Supreme Court suggested that such an argument might be plausible, though it failed to decide the issue conclusively. In the second decision, Bush vs. Gore, three justices - Antonin Scalia, Clarence Thomas and Chief Justice William Rehnquist -embraced the view that the Florida Supreme Court's actions violated Article II. Dissenting justices argued that the Florida court decision was simply an interpretation of the legislature's existing rules.

There is little doubt that opponents of Amendment 36 will make a similar argument in the Colorado case because the initiative will have been passed by the voters of Colorado and not the legislature. How will the Supreme Court handle the issue if it arises again?

A 1916 Supreme Court case suggests the Colorado initiative complies with Article II, but Rehnquist, Scalia and Thomas recently cast doubts on this precedent as applied to Colorado.

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