Spending by outside groups in Massachusetts' special U.S. Senate election has topped $2.2 million in the final weekend before the primary.
By far the largest amount spent so far — nearly 84 percent — is supporting Democrat Edward Markey.
The rest is split between fellow Democratic congressman Stephen Lynch and two of the three Republican candidates - Cohasset businessman Gabriel Gomez and former U.S. Attorney Michael Sullivan.
An Associated Press review of campaign finance records found that the League of Conservation Voters which has spent nearly $831,000 to back Markey, the most of any group.
NextGen Committee, which opposes the Keystone XL pipeline, also hopes to defeat Lynch and has spent more than $547,000.
The top group supporting Lynch is the International Association of Firefighters, which spent nearly $106,000.
The primary is Tuesday.
This program aired on April 27, 2013. The audio for this program is not available.