Reason Morning Links: Carnage in Baghdad, Primary To Fill Kennedy Seat, Good News in the Cancer Wars

• Obama warns Pakistan: Crack down on Taliban, or U.S. will use force on other side of the Afghan border.
• Car bombs kill at least 127 in Baghdad.
• Winner of today's Democratic primary in Massachusetts expected to coast in election to fill seat of the late Sen. Ted Kennedy.
• Cancer incidence, death rates in the U.S. continue to fall.
• Senate compromise expected to kill off the "public option."