Obama's new signature on policies -- tweaked or switched

— -- President Obama has reversed or modified many policies set by the Bush administration and is seeking to change more. Some changes are major, others less so, but they leave little doubt that the White House is now run by members of a different party with a different political outlook. Key differences:

Abortion

Obama:An abortion rights supporter, he lifted a Bush-era rule that prevented federal money from going to international family-planning clinics that discuss abortion with clients.

Bush:An opponent of abortion rights, he set the so-called "gag rule," which blocked overseas clinics that receive federal funding from counseling clients about abortion. Bush believed federal policy should support the "culture of life."

Afghanistan

Obama:So far, he has emphasized the Afghanistan war over the Iraq conflict. He authorized deployment of 21,000 additional U.S. troops to the Afghanistan theatre.

Bush:He emphasized the Iraq war over the one in Afghanistan. Still, he authorized about 12,000 more troops for Afghanistan to be deployed during the last five months of his presidency.

Cuba

Obama:He relaxed rules so Cuban Americans can visit relatives on the island and send them unlimited amounts of money.

Bush:He restricted travel to the island by Cuban Americans to once every three years and limited remittances to $1,200 a year.

Global warming

Obama:On his watch, the Environmental Protection Agency has ruled that greenhouse gases threaten public health by increasing global warming. He has asked Congress to set limits on emissions.

Bush:He opposed legislation curbing greenhouse-gas emissions, calling it excessive regulation that would hurt U.S. industry, especially against Chinese and Indian competitors.

Guantanamo Bay

Obama:In one of his first acts, he ordered the prison for terror suspects to be closed by January 2010.

Bush:He opposed setting a timeline for closing the facility and noted that his administration had trouble finding countries willing to take prisoners.