Dear Mr. Schieffer:

You have an extraordinary opportunity that is rare in presidential politics. While every presidential debate is potentially pivotal, only rarely has one carried the potential that yours does to change the race in its closing days.

Both of the previous debates have been flawed. The first debate was supposed to be about foreign policy, but recent events led to the first half of the debate discussing the economy instead. The second debate was supposed to be a freewheeling townhall, but your colleague Tom Brokaw made it a stifling, over-structured affair that was anything but a townhall.

As much as anything, Mr. Brokaw’s choice of topics for the second debate robbed the American people of what was intended to be a look into the more personal and controversial aspects of the candidates. In that debate focusing on domestic policy, there was not a single question about the Supreme Court, gun control, abortion, gay marriage or immigration. It strains credulity to assert that of the more than 1,000 questions offered to Mr. Brokaw, he could not find any that spoke to these issues.

Such matters may not be of much concern to East Coast elites, but they are of profound importance to countless American voters. As surprising as it may be to pundits, literally millions of voters decide their vote solely on one of these hot-button issues.

Mr. Brokaw’s decision to avoid those topics has raised the suspicions of some, alleging that NBC was sheltering Barack Obama by blocking questions that backed Mr. Obama into a corner. While Mr. Brokaw deserves the benefit of the doubt, you could lay the matter to rest by raising the questions in the third debate that ought to have been asked in the second.

This year the Supreme Court handed down a historic decision on the meaning of the Second Amendment when it struck down the D.C. gun ban. Now the NRA has endorsed John McCain and Sarah Palin over Barack Obama and Joe Biden. Where does Mr. McCain agree and disagree with the NRA? Why did Barack Obama say he supported the Supreme Court decision when he had a twelve-year record of supporting handgun bans and still did as recently as earlier this year?

California’s Supreme Court has declared a constitutional right to same-sex marriage, and voters are considering a state constitutional amendment to supersede the state court. Why does Mr. McCain oppose a federal marriage amendment yet support state amendments such as California’s? What exactly is Mr. Obama’s position on same-sex marriage and rights? Continued...