Groups pouring millions into Mass. US Senate race

BOSTON (AP) -- Outside political groups are pouring millions into Massachusetts' U.S. Senate race.

The groups appear to be honoring a deal signed by Republican Sen. Brown and Democrat Warren designed to keep outside ads off television, radio and the Internet.

Instead the groups are focusing on mass mailings, door-to-door canvassing and automated phone calls, also known as "robocalls," as they try to appeal directly to voters.

To date, the groups have spent more than $2.1 million on the race.

An Associated Press review of Federal Election Commission reports show those groups supporting Warren and opposing Brown have spent more than $1.3 million.

That's almost twice as much as the nearly $800,000 spent by groups supporting Brown and opposing Warren.

The group that has spent the most is the League of Conservation Voters, which opposes Brown's re-election.