Morning Buzz: June 20, 2007

New York City Mayor Michael Bloomberg announced on Tuesday that he is leaving the Republican Party, moving a step closer to what many have speculated as an intended third-party bid for the White House.

U.S. military forces continue their offensive against Sunni insurgents on the outskirts of Baghdad, killing at least 30 suspected terrorists, the AP reports.

President Bush is expected to veto stem cell legislation today that was passed by the House of Representatives two weeks ago and the Senate earlier this year, marking the second time he has vetoed legislation that would have increased federal funding for such research.

Wanted: applicants for a 520-day simulated Mars expedition here on Earth, in which six astronauts will make a dry run for a Mars mission in cramped quarters.

An ancient Indian settlement in Utah that was once kept tightly under wraps has been uncovered by archaeologists, who say the remains of the civilization are remarkably well preserved.