CNN

Obama compared Pres. Bush and McCain to Batman and Robin.

ALBUQUERQUE, New Mexico (CNN) – Barack Obama took his comparisons of John McCain and President Bush one step further Saturday night at a rally in New Mexico, implying the two Republicans are like the duo of Batman and Robin.

"John McCain suggested that he would be the one to change George Bush's policies," Obama said, before adding that if that were to happen it'd be "like Dick Cheney attacking George Bush."

"It's like Robin getting mad at batman. John McCain hasn't been a maverick. He's been a sidekick when it comes to George Bush's economic policies.”

Earlier in the weekend, Obama said running mate Joe Biden had said McCain criticizing Bush would be "like Tonto getting mad at the Lone Ranger."

Biden never actually said that - but he has made similar references using Butch Cassidy and the Sundance Kid.

The Illinois senator heads to battleground Colorado for events Sunday.