Clinton attacks Obama ahead of debate

By Steve Holland

LAREDO, Texas (Reuters) - Democrat Hillary Clinton on Thursday questioned rival Barack Obama's readiness to serve as commander in chief and his ability to win the White House as the two presidential contenders prepared for a crucial debate.

The Thursday night showdown in Austin, Texas, gives Clinton a chance to halt Obama's momentum and turn around a Democratic presidential fight that has shifted decisively in the Illinois senator's favor after his streak of 10 straight victories.

"I want you to think, 'Who do you want to have in the White House answering the phone at 3 o'clock in the morning when some crisis breaks out around the world?'" Clinton asked a heavily Hispanic crowd at a rally in downtown Laredo.

"'Who is best prepared to be commander in chief on day one?'" she added, pushing her latest line of attack on Obama in their hard-fought duel to be the Democratic candidate in November's presidential election.

In the Republican race, front-runner John McCain dismissed a New York Times report suggesting he had a close and possibly romantic relationship with a female lobbyist nine years ago who represented companies that did business with the Senate committee he led.

The newspaper reported his aides became concerned the potentially embarrassing conflict of interest could harm his ultimately failed presidential bid in 2000. The Arizona senator told reporters in Toledo, Ohio, the article was "not true."

"At no time have I ever done anything that would betray the public trust or make a decision which in any way would not be in the public interest and would favor any one or any organization," McCain said.

McCain aides and allies launched a counter-attack on the Times, with his campaign manager Rick Davis telling supporters the story was part of an "unsourced hit-and-run smear campaign."