On Nov. 4 we're going to elect a president to lead us through a perilous time and restore in us a common sense of national purpose.

The strongest candidate to do that is Sen. Barack Obama. The Tribune is proud to endorse him today for president of the United States.

Many Americans say they're uneasy about Obama. He's pretty new to them.

We can provide some assurance. We have known Obama since he entered politics a dozen years ago. We have watched him, worked with him, argued with him as he rose from an effective state senator to an inspiring U.S. senator to the Democratic Party's nominee for president.

We have tremendous confidence in his intellectual rigor, his moral compass and his ability to make sound, thoughtful, careful decisions. He is ready.

It is, though, hard to figure John McCain these days. He argued that President Bush's tax cuts were fiscally irresponsible, but he now supports them. He promises a balanced budget by the end of his first term, but his tax cut plan would add an estimated $4.2 trillion in debt over 10 years. He has responded to the economic crisis with an angry, populist message and a misguided, $300 billion proposal to buy up bad mortgages.

McCain failed in his most important executive decision. Give him credit for choosing a female running mate--but he passed up any number of supremely qualified Republican women who could have served. Having called Obama not ready to lead, McCain chose Alaska Gov. Sarah Palin. His campaign has tried to stage-manage Palin's exposure to the public. But it's clear she is not prepared to step in at a moment's notice and serve as president. McCain put his campaign before his country.