This question, which I seem to recall hearing way back in grade school, is fundamentally silly. In nature, there are no absolutes. So the simply answer is: we discover that the force was not irresistible, or that the object was not immovable, or both.
Likewise in politics, there are no absolutes. A regime (object) can be formidable, as can an opposition (force) to that regime. The greater the forces when they clash, the more likely that the political landscape will be drastically and permanently transformed by the encounter.
The "Immovable" Object:
No longer. For perhaps the first time in our history, a significant number of administration officials and supporters, including perhaps the President himself, must keep themselves and their party in power to avoid criminal indictment, conviction, and imprisonment. For it can scarcely be doubted that these individuals have committed numerous crimes, as they have, in fact, proclaimed themselves above the law. Among these crimes: disclosure of a covert intelligence agent, waging an illegal war, lying to Congress, violation of the Geneva accords on treatment of prisoners, unlawful incarceration of both citizens and aliens, illegal surveillance of private citizens, bribery, and much more. These crimes are well known. Surely there are many additional crimes that have been successfully hidden by this secretive regime, but would likely be discovered and prosecuted should an opposition party take control of the government.
In addition, there are ill-gotten fortunes, and political and economic advantages at stake. Billions of dollars of public money have been "transferred" into the private hands of Bush and GOP supporters much of that cash unaccounted for. Deregulation and tax policies have lavishly benefited the most wealthy among us, while the incomes and personal wealth of the poor and middle class have stagnated or even declined. Were the GOP to be driven from office and economic justice restored, all these gains and advantages might come to an end.
This the GOP will not allow, and they are in a position to prevent it, whatever the cost and whatever the methods required, including election fraud, regardless of the wishes and the actual votes of the American people. There is abundant and compelling evidence that they have committed election fraud in the previous three national elections, notwithstanding the dogged refusal of the mainstream media to report this evidence or of the Democratic party to recognize the fraud and to initiate criminal and civil action against these crimes.
Absent any dramatic breakthroughs in the investigation of election fraud, and absent the widespread adoption of reliable methods of voting certification, it is virtually certain that the Republicans will once again steal the Congressional elections in November, and the Presidential election of 2008. And Lincoln's government of, by and for the people will be no more.
Yet the Democrats and the media pretend that these pending elections will be fair and accurate, just like all the others, and that the Democrats have an excellent chance of regaining the Congress in November, and the White House in 2008. Talk of stolen elections, past and future, is just not acceptable in polite political conversation.
Accordingly, a perpetual GOP control of government appears to be an immovable political object.
The "Irresistible" Force:
The good news, is that these conditions are not likely to remain in place. For even now, some significant events are afoot. Among them:
Bush and Cheney have taken on the New York Times, which has heretofore been a Bush enabler. And this time, several "conservative" newspapers have come to the defense of the Times, and more generally, the First Amendment freedom of the press. Will more of the print media follow in support? To the Busheviks, it is not enough that the media be supporters; the media obedience must be total. Now the high-voltage Bushevik charges of "treason" over the New York Times' disclosure of the latest Bushevik outrage may pull the it back into line, or it might be the final straw that chases the Times off the reservation. If so, where the Times leads others may follow.