Today on the presidential campaign trail

Obama and Biden plan post-convention bus tour of Pennsylvania, Ohio and Michigan ... GOP 'war room' revs up as high-profile figures hit airwaves to slam Obama ... Democrats plan heavy presence at GOP convention, will greet delegates with Bush billboard

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Obama to tour battleground states after nomination

DENVER (AP)--Barack Obama, his wife Michelle and running mate Joe Biden will embark on a bus tour of battleground states Pennsylvania, Ohio and Michigan later this week after he receives the Democratic presidential nomination, his campaign announced Wednesday.

That nomination will formally come later Wednesday as delegates to the Democratic National Convention crown Obama as the first black nominee of a major political party.

Obama was due to arrive in the convention city Wednesday afternoon.

Former President Clinton was also set to deliver a prime-time address to the convention, a day after his wife, Hillary Rodham Clinton, sought to unify the party after a bitter primary season, delivering the second part of a one-two punch.

Anticipating Wednesday night's focus on national security at the Democratic National Convention, Republican John McCain contended in a new TV ad that Obama showed he was "dangerously unprepared" for the White House when he described Iran as a "tiny" nation that didn't pose a serious threat.

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