Denver, Colorado - Republican presidential candidate John McCain congratulated Democrat Barack Obama on his nomination Thursday, but a McCain spokesman said that Obama's acceptance speech did nothing to ease voters' concerns about his inexperience.

McCain, in an advertisement that aired on television networks just before Obama formally accepted the party nomination for president, said it was "truly a good day for America."

McCain noted that Obama's acheivement as the first African- American major-party nominee fell on a "historic day," the 45th anniversary of civil-rights leader Martin Luther King Jr's famous "I have a dream" speech.

"Tomorrow, we'll be back at it," McCain said. "But tonight Senator, job well done."

McCain spokesman Tucker Bounds did release a statement shortly after Obama accepted the party nod, sounding the campaign's daily theme that Obama, who was first elected to the US Senate in 2004, is too inexperienced to lead the country.

"Americans witnessed a misleading speech that was so fundamentally at odds with the meager record of Barack Obama," Bounds said. "The fact remains: Barack Obama is still not ready to be president." (dpa)