Click here to watch "Debra."

Hillary Rodham Clinton takes center stage in Denver tonight for her speech at the Democratic National Convention. But as Democrats scramble to project a message of party unity, Republicans are also putting the New York senator front and center -- in a series of new attack ads intended to keep the focus on Democratic divisions.

On Monday, John McCain's camp released "Debra," in which former Clinton delegate Debra Bartoshevich endorses the Arizona senator. "I respect his maverick and independent streak, and now he's the one with the experience and judgment," Bartoshevich says. "A lot of Democrats will vote McCain. It's OK, really!"

The Wisconsin Democratic Party rescinded Bartoshevich's delegate status in July after she publicly stated that she would vote for McCain if Barack Obama won the nomination over Clinton.

In another negative spot released Tuesday morning, the McCain camp explicitly borrows from Clinton's infamous "3 a.m." ad released during the Democratic primary campaign. McCain's version uses the same stock footage and voice-over as the Clinton spot and suggests that the New York senator was right to question Obama's readiness to lead. The ad also shows video of nuclear missiles and Islamic radicals to reiterate the Republicans' claim that the next president will take office at a dangerous point in history and must be ready to protect America.

The Republican National Committee, in step with its candidate, released an almost identical spot on Monday. Like McCain's "3 A.M.," the RNC's "Right" features a news clip from the primary campaign in which Clinton implies that McCain is more qualified to lead than Obama. "Now Americans must ask ourselves: Should we elect the most inexperienced presidential candidate of our times? Or was she right?" an announcer says ominously.

The GOP's Clinton strategy has been in full effect since Sunday, when -- at precisely 3 a.m. -- McCain released "Passed Over," which suggested that Obama kept Clinton off his VP short-list as punishment "for speaking the truth" about him in the primary campaign.

So how does Clinton, who has repeatedly endorsed Obama, feel about suddenly being presented as a McCain spokesperson? Speaking to the Hispanic Caucus meeting Monday morning at the Democratic National Convention, she fought back against the GOP insinuations. "I am Hillary Clinton and I do not approve of that message," the New York senator quipped.

Meanwhile, the Democratic presidential nominee had his own message for McCain on Monday. Obama's camp released "Don't Know Much," a light-hearted spot that alters the lyrics of the classic song "Wonderful World (Don't Know Much About...)" to mock McCain's record on the economy and his ties with President Bush.

-- Mary Gilbert contributed to this report.